A stroller is provided with a seat back capable of being reclined by a reclining mechanism. The stroller includes a handle (15), and a seat back (10a) having a pipe frame (22) pivotally supported on the handle (15) and having the shape of the inverted letter U. The handle (15) is provided with a plurality of stopping steps (32), and retaining members (31) capable of being engaged with the stopping steps (32) are supported respectively in end parts of the pipe frame (22) so as to be advanced and retracted. The pipe frame (22) has a horizontal upper part (22a), and an unlocking device (36) for pulling up the retaining members (31) to disengage the same from the stopping steps (32) is held on the horizontal upper part (22a). |