PURPOSE: To provide anchor bolts for installing a solar cell on a roof, which absorb vibrations in the lengthwise and lateral directions and can prevent solar cell modules and the like from being broken.

CONSTITUTION: Anchor bolts 3 for installing a solar cell on a roof are respectively constituted of each mounting plate part 11, which is fixed on a roof board 4 by driving nails, for example, in the board 4, and each support pillar part 12, which is vertically provided on this mounting plate part 11 and has a screw part 12a formed on its point part. In each support pillar part 12, screw parts 12b are formed on the base end part of the part 12 and at the same time, a vibration absorbing part 12c, which is formed by bending twistingly the part 12 as much as one rotation, is formed between the screw parts 12b formed on the base end part and the screw part 12a formed on the point part. Threaded hole parts 11a, into which the screw parts 12b formed on the base end part of each support pillar part 12 are screwed, are formed in each support pillar part 12.