To change a vehicle height at low cost without preparing a lower arm different in a specification when a vehicle height of an existent car of a strut type suspension.

This lower arm adaptor for changing a vehicle height comprises: a block 41 whose plane upper and lower surfaces from a predetermined angle; a ball 42 for ball joint provided on the upper surface side of the block 41; and an attaching part 43 provided on the lower surface side of the block 41. In a strut type suspension, the block 41 is attached by the attaching part 43 to the tip 24A of the lower arm inversely attached to a vehicle body.