Patent ID: 8814127

Claim:
A fixing device for fixing an antenna device through a fixing opening provided on a mounting surface, comprising: a base member; a fixing member which has a shape that is inserted into the fixing opening and that is abutted against a periphery of the fixing opening; and a guide which guides the base member to the fixing opening, wherein the fixing device takes: a main fixed state in which the mounting surface is clamped between the fixing member and the base member by means of inserting the fixing device into the fixing opening and rotating the fixing member at a predetermined angle; and an initial fixed state in which the fixing member is initially fixed with respect to the base member before the fixing member is rotated at the predetermined angle, and the guide is arranged at a position to surround the fixing member in the initial fixed state, and includes plural guide portions which have greater height than that of a lower end of the fixing member in the initial fixed state, regarding the height from the base member.