To provide a vehicular wheel cap capable of suppressing increase in friction at the time of attaching/detaching operation by hole diameter difference of each bolt insertion hole.

At a tip end portion of each arc-shaped locking hook 2, a wheel nut side abutting portion 21 abutting on a conical taper portion formed on each wheel nut N, and a wheel side abutting portion 22 abutting on an inclined surface portion 53 tilting toward a vehicle inside from a flat surface opening edge portion 52 of a bolt insertion hole 51 in a wheel 5 are formed. The wheel side abutting portion 21 and the wheel side abutting portion in the arc-shaped locking hook 2 are formed to have a generally small diameter arc-shaped cross section so as to point-contact with the conical taper portion 4 formed on each wheel nut N and the inclined surface portion 53 in the wheel 5. A recessed portion 23 recessed inward is formed between the wheel nut side abutting portion 21 and the wheel side abutting portion 22.