The present invention provides a sheet detecting apparatus that detects a sheet, the sheet detecting apparatus comprising: a lever member; a biasing portion that biases the lever member for a first position where the abutting surface abuts against the leading end of the sheet; a supporting mechanism that movably supports the lever member to move in an order of the first position, a second position to which the lever member moves by the sheet against the biasing force of the biasing member, and a third position where the lever member abuts on a surface of the sheet and waits in order to move to the first position when a trailing end of the sheet passes the lever member, while keeping a abutting surface of lever member facing upstream; an interlocking portion that interlocks with the lever member; and a detector that detects a position of the interlocking portion.