To provide an inner boot for a sports shoe, which is improved in the feeling of fitness for users, simple in structure, reducible in manufacturing cost and adjustable in length by eliminating the drawbacks of prior art.

The innerboot is composed of a front member (2) for wrapping the tiptoes and front part of the wearer and a rear part (6) extending in a region ranging from the arch of the foot to the heal. The front member (2) is connected to at least one rear member (6) via a bellows-like connecting member (14), which becomes longest when it is not used.