PROBLEM TO BE SOLVED: To provide a wheelchair locking device that facilitates alignment (installing alongside) and prevents displacement of a wheelchair to thereby improve safety, when the wheelchair is connected to a locking installation installed alongside in a freely locking/unlocking manner.SOLUTION: Front and rear legs 11, 12 in a wheelchair body 21b of a wheelchair 2b are chucked with a connecting board 7 comprising a rigid member provided at the side of a bathtub 4. The connecting board 7 includes a base board 71, a pair of pinching pieces 72, 73, a support piece 74 and a clamping dial 75. As shown in A1, the rear leg 12 of the wheelchair 2b is fitted in a clamping piece 72. As shown in A2, the front of the wheelchair 2b is pulled over and the leg 11 is fitted in the inside of the clamping piece 73. As shown in A3, a clamping dial 75 is tightened, and thereby the legs 11, 12 are held between the clamping pieces 73, 72 and the wheelchair 2b is locked to the sidewall 42 of the bathtub 4. Accordingly, the device facilitates alignment, and can prevent the side toppling and side slipping of the wheelchair 2b to thereby improve safety.
