To provide a brake control system of a hand carrier capable of precisely braking a wheel and maintaining it.

The wheel 6 constituted of a disc wheel 6a and a rubber tire 6b is axially supported on a pair of side part pieces 4a, 4a of a wheel frame 4 mounted on a load carrying platform 1 free to roll by an axle 5. This brake control system of the hand carrier is constituted of an engaging plate 6c accumulated and mounted on one surface of the disc wheel 6a with a clearance, a large number of circular engaging holes 7 provided concentrically around the axle 5 as their center and in parallel on the engaging plate 6c, a coil spring 21 to energize the engaging hole 7 in a direction where a round bar type regulating rod 8 to be engaged and separated is engaged, a device base frame 9 provided on a surface of one of the side part pieces 4a of the wheel frame 4 and to receive and support the regulating rod 8 free to move in a direction of the engaging plate 6c and a driving handle 24 to release the regulating rod from the engaging hole 8 against the coil spring 21.