FIRST JOINING MEMBER, SECOND JOINING MEMBER, AND JOINING STRUCTURE

A first joining member configured to be used to join an instrument panel reinforcement to a vehicle body includes upper and lower body fastening surfaces to be fastened to the vehicle body. The first joining member is configured to be able to hold the instrument panel reinforcement between the upper and lower body fastening surfaces. There is defined an imaginary line that is orthogonal to an imaginary plane connecting the upper and lower body fastening surfaces, and passes through a center axis, extending in a vehicle-width direction, of the instrument panel reinforcement held by the first joining member. A distance along the imaginary line from the center axis to the imaginary plane is equal to or shorter than a distance along the imaginary line from the center axis to an outer circumferential surface of the instrument panel reinforcement.