A double-blank detecting apparatus (302) for a press machine (100) that is provided with a die cushion apparatus (200) and is configured to form blanks (80) one by one automatically and repeatedly. The double-blank detecting apparatus (302) includes: a position signal acquiring unit (320) configured to acquire a slide position signal indicating a position of a slide (110) of the press machine (100); a load signal acquiring unit (310) configured to acquire a die cushion load signal indicating a die cushion load generated on a cushion pad (128) of the die cushion apparatus (200); and a double-blank detector (330) configured to detect a state in which a plurality of blanks (80) are stacked as a double blank based on the slide position signal acquired by the position signal acquiring unit (320) and the die cushion load signal acquired by the load signal acquiring unit (310).