Wheelchair fixing mechanism

The invention provides a wheelchair fixing mechanism which facilitates alignment of a locking pin and a clamping lock. A wheelchair fixing mechanism according to one aspect of the present disclosure is configured to fix a wheelchair to a fixing portion provided on a vehicle. The wheelchair fixing mechanism is provided with a clamped part and a clamping part. The engaged part is provided with at least one locking pin, and the at least one locking pin is in a rod shape and extends in the vertical direction. The engagement portion has a housing portion that houses the lock pin, a latch that restricts the lock pin from disengaging from the housing portion, and a guide portion that guides the lock pin toward the housing portion. The guide portion has a first guide surface and a second guide surface, the first guide surface and the second guide surface are opposed to each other in the width direction of the wheelchair, and the distance between the first guide surface and the second guide surface becomes smaller tow