The Japanese company made a net loss of 37.1bn yen ($390m; £237m) between April and June, compared with a profit of 35bn yen for the same period last year.
The loss was, however, not as large as market expectations, thanks to Sony's continuing efforts to cut costs.
In May, Sony reported its first annual loss in 14 years. It also expects a loss this financial year.
Sony's revenues for the April-to-June period, its fiscal first quarter, were down 19% from a year earlier to 1.6 trillion yen.
Sales of its core consumer electronics products - which includes everything from its televisions to cameras and digital music players - were down 27%.
'Uncertain' trading
In addition to continuing falls in global sales, the firm said it was also being hit by the high value of the yen, which had sharply reduced its overseas earnings.
Sony's chief financial officer Nobuyuki Oneda said the firm's trading conditions remained "uncertain".
The company is now continuing with 16,000 job cuts as it sheds 10% of its global manufacturing capacity, but some analysts have questioned whether this is enough.
Analyst Mitsushige Akino, chief fund manager at Ichiyoshi Investment Management, said Sony's cost reductions should have been "more aggressive".
"Sony is making changes to adapt to the environment but it still seems to be having trouble keeping up," he said.
Another analyst, Hiroshi Sakai of SMBC Friend Securities, said the worst of the global recession may now be over for Sony and the other main electronics firms.
However, he added that a full recovery "may be delayed until next year".
Led by Welsh-born chief executive Sir Howard Stringer, Sony has more than 180,000 staff.