I'm CFO, Kenichiro Yoshida, and today, I would like to explain 2 topics in the next 15 minutes. Consolidated sales in the third quarter increased 12% year-on-year to JPY 2,672,300,000,000. Consolidated operating income was JPY 350.8 billion, approximately 3.8x the same quarter of the previous fiscal year. Net income attributable to Sony Corporation shareholders was JPY 295.9 billion.
As is shown in this slide, operating income in the third quarter, the previous fiscal year and the current fiscal year included certain extraordinary items. Excluding those items, operating income would have increased by JPY 137.4 billion. This chart shows the cumulative results for the first 9 months of the fiscal year. Adjusted operating income increased by JPY 263.7 billion or approximately by 65%.
This chart shows the results by segment for the third quarter. Please note that we have changed the order of segments from this quarter. This slide shows the results by segment for the first 9 months of the fiscal year. Next is the consolidated results forecast for fiscal '17. Consolidated sales remains unchanged from our October forecast at JPY 8.5 trillion. We have revised upward our operating income forecast by JPY 90 billion to JPY 720 billion. We have also upwardly revised our forecast for net income by JPY 100 billion to JPY 480 billion, partially due to the recording of JPY 13.8 billion gain in the third quarter resulting from the recent tax reform in the U.S.
For several years, we have had valuation allowances recorded against our deferred tax assets in the United States. As a result, the reduction in corporate tax rate brought about by the tax reform in the U.S. has not caused a onetime increase in income tax expenses. This fiscal year results -- the fiscal year results forecast for each segment are shown on this slide, and as you can see, we have upwardly revised our operating income forecast in the Music, Semiconductors and Financial Services segment.
At the time of October forecast, we have incorporated a loss of JPY 50 billion in corporate and elimination as contingency for business risks, but no contingency is included in the forecast this time. Operating results are trending well, but we recognize that these results are being supported by external tailwinds such as forex and the stronger global economy.
We expect forex, one of the external tailwind, to have approximately JPY 60 billion positive impact on the 5 electronic segments in total for the fiscal year.
And I will now turn to the situation in each of our businesses. First, I will talk about Game & Network Services segment. Sales for the quarter increased 16% year-on-year, primarily due to an increase in PS4 software sales and the impact of forex. Network sales have increased 41% year-on-year and have exceeded JPY 300 billion on a quarterly basis for the first time. Operating income increased JPY 35.3 billion year-on-year to JPY 85.4 billion, primarily due to the increase in sales and the impact of foreign exchange rates.
We had a strong holiday season with cumulative sales through units of PS4 exceeding 73.4 million unit as of the end of December last year. In addition, subscribers to PS Plus, our paid subscription service, exceeded 31.5 million as of the end of December last year. We have reduced our forecast for fiscal year sales by JPY 60 billion compared with October forecast to JPY 1,940,000,000,000. This is due to a change in the launch date of a certain software title as well as an increase in sales of PS4 hardware at proportional prices during the holiday season. Our fiscal year unit sales forecast for PS4 remains unchanged at 19 million units.
Our forecast for operating income remains unchanged at JPY 180 billion because the impact of the above-mentioned decrease in sales is expected to be offset by the reduction in SG&A expenses.
Next, I will talk about the Music segment. Third quarter sales increased 22% year-on-year and operating income increased JPY 11.4 billion to JPY 39.3 billion. The mobile game application, Fate/Grand Order, continued to make a significant contribution to financial performance. Streaming revenue continues to grow, increasing 37% year-on-year.
We have upwardly revised our forecast for sales by JPY 50 billion to JPY 780 billion from October forecast to reflect the strong performance through the third quarter. We also upwardly revised our forecast for operating income by JPY 16 billion to JPY 110 billion due to the increase of sales.
Next, I will talk about the Pictures segment. Sales increased 16% year-on-year, and operating income improved JPY 117.3 billion to JPY 10.5 billion. This significant improvement in results was due to the absence of the above-mentioned JPY 112.1 billion impairment charge of goodwill recorded in the same quarter of the previous fiscal year. Jumanji, which we released near the end of December, has been performing very well at the box office. There's no change to our fiscal year forecast for sales and operating income. Although the above-mentioned Jumanji has been performing quite well, we expect its positive impact to be offset by the negative impact of lower home entertainment sales, including DVD and Blu-ray sales.
Next is Home Entertainment & Sound segment. In the third quarter, sales increased 22% year-on-year, and operating income increased JPY 20.3 billion to JPY 46.2 billion. The increase in sales and operating income was primarily due to a shift to high value-added models, primarily 4K Televisions, and the positive impact of foreign exchange rates.
We have upwardly revised our forecast for operating income by JPY 4 billion to JPY 80 billion, primarily due to an improvement in product mix in Audio and Video.
Next, I would explain the Imaging Products & Solutions segment. Third quarter sales increased 8% year-on-year, and operating income increased JPY 4.9 billion to JPY 26 billion. The increase in sales and operating income was primarily due to the positive impact of foreign exchange rates and a shift to high value-added models. There's no change to our forecast for the fiscal year.
Next, I will talk about the Mobile Communications segment. During the third quarter, sales decreased 13% year-on-year primarily due to a decrease in smartphone unit sales.
Operating income decreased JPY 5.4 billion to JPY 15.8 billion. This decrease was primarily due to the above-mentioned decrease in unit sales and an increase in the price of key components and the negative impact of foreign exchange rates, partially offset by reductions in operating costs and the reversal of patent royalty accrual.
We have lowered our forecast for annual smartphone unit sales by 1.5 million units from our October forecast to 14 million units. As a result, we have reduced our sales forecast by JPY 40 billion to JPY 740 billion. The forecast for operating income remains unchanged.
We would like to generate a profit again this fiscal year primarily by offsetting the negative impact of the above-mentioned decrease in unit sales by reduction in operating costs.
Next, I will talk about the Semiconductors segment. In the third quarter, sales increased 7% year-on-year, and operating income increased JPY 33.4 billion to JPY 60.6 billion. The increase in sales and operating income was primarily due to an increase in unit sales of image sensors for mobile products. The sales for the third quarter includes some revenue from fourth quarter shipments that were accelerated due to the timing of an upgrade of our supply chain management system.
We have reduced our sales forecast by JPY 30 billion compared with the October forecast to JPY 850 billion due to a decrease in unit sales of image sensors for mobile products shipped to Chinese smartphone makers.
We have upwardly revised our operating income forecast by JPY 5 billion to JPY 155 billion primarily due to an increase in gains from asset sales and a reduction in expenses, partially offset by the decrease in sales. Short-term demand for image sensors for mobile products is fluctuating, but we expect growth to come from the adoption of dual lens and sensing applications.
Moreover, our view that the market for image sensors will grow over the mid to long term is unchanged because we expect growth to come from other applications such as automotive as well.
Lastly, I will explain the Financial Services segment. Third quarter Financial Services revenue increased 17% year-on-year and operating income increased JPY 27.3 billion to JPY 56.3 billion. This increase in operating income was primarily due to the recording of a gain on the sales of real estate held for investment purposes and a decrease in net losses on derivative transactions to hedge market risk.
We have raised our forecast for Financial Services revenue and operating income to JPY 1,250,000,000,000 and JPY 175 billion, respectively. These upward revisions were due to the fact that results in the third quarter were higher than the October forecast.
Now I would like to discuss our assessment of the financial strength of Sony. First, I will discuss cash flow. This slide shows a consolidated cash flow excluding the Financial Services segment because the nature of the Financial Services business differs from our other segments. For the first 9 months of the fiscal year through the end of the third quarter, the combination of operating and investment cash flow was positive JPY 237.7 billion, as is shown at the bottom of this slide. Cash flow has improved significantly compared with the same period of the previous fiscal year when it was negative JPY 160.6 billion. This is primarily due to an improvement in profit.
Now I'd like to discuss the state of our balance sheet. On the right side of this slide, you can see your balance sheet, excluding the Financial Services segment. As of the end of December 2017, Sony Corporation's stockholders' equity was about -- approximately JPY 2.2 trillion.
If we look back over the last 10 years, stockholders' equity decreased from a peak of approximately JPY 3.3 trillion at the end of December 2007 to a low of approximately JPY 1.4 trillion at the end of September 2012. However, primarily due to improved operating performance since that time, equity has recovered somewhat. As I mentioned earlier, cash flow has significantly improved recently but stockholders' equity has just begun to improve.
Going forward, in order to make proactive investments for future growth, we want to enhance stockholders' equity and our overall financial position a little further through continued recording of profit.
This ends my presentation. Thank you.