PROBLEM TO BE SOLVED: To provide a seat surface plate for a wheelchair enabling a seated person to keep a good posture, and capable of preventing a risk of fall of the person therefrom, which is a seat surface plate mountable simply on a wheelchair, and manufacturable inexpensively.SOLUTION: A seat surface plate has a constitution in which adjustable adjustment members are provided on a lower surface, and each one of locking pawl parts is fixed to the end of each one of the adjustment members, and is mountable on a wheelchair by locking the locking pawl parts onto locking parts provided on a seating face side frame of the wheelchair.SELECTED DRAWING: Figure 4
