A stroller includes a stroller frame having two opposite side frames, two first connecting devices disposed respectively on the two side frames of the stroller frame, a first removable seat including a seat body and two second connecting devices disposed respectively on two sides of the seat body of the first removable seat, a second removable seat including a seat body, and two third connecting devices disposed respectively on two sides of the seat body of the second removable seat. The first connecting devices are selectively and respectively connected with the second connecting devices or the third connecting devices so as to selectively mount the first removable seat or the second removable seat to the stroller frame.