A suitcase with a foldable chair usable as a normal suitcase and also usable as a cart, a chair or a buggy, comprising a suitcase body (11), a pair of wheels (14b) attached onto the bottom surface of the suitcase body near the rear surface, a foldable base plate (12) rotatably installed on the front surface side of the suitcase body at the lower position, a pair of wheels (14a) fitted to the tip of the foldable base plate, fixing devices (13) fixing the foldable base plate to the suitcase body, a foldable seat plate (21) rotatably installed on the front surface of the suitcase body at the position over the installed the foldable base plate, and auxiliary rails (24) opposedly installed on both sides of the foldable base plate rotatably relative to the suitcase body.