To simplify an adhesive agent coating process to a screw, in a housing structure in which the screw is assembled to a housing.

A through hole 30 having one opening 31 at a screw head 27 and the another opening 32 on an outer peripheral face of a male screw portion 28, is formed in an adjustment screw 25 engaged with a screw hole 9b formed on a gear housing portion 9 of a throttle valve device 1. As an adhesive agent can be injected from the opening 31 and flow out from the opening 32 to be attached to the male screw portion 28, the adhesive agent can be applied to both of the screw head 27 and the male screw portion 28 by one process of injecting the adhesive agent from the opening 31.