A bicycle foot peg of a hollow construction is fastened at one end thereof with a bicycle frame and provided in the inner wall of the open end thereof with an inner threaded portion. A fitting seat is disposed in the hollow interior of the bicycle foot peg and provided with a plurality of slots for holding hand tools such as a screwdriver and wrench. An outer cap is used to seal off the open end of the foot peg such that the outer cap is engaged securely with the outer end of the fitting seat, which in turn is engaged with the inner threaded portion of the foot peg.