An interface section 200 of a structure 100 includes a plurality of contacts 120, each of the contacts having a contact portion 122 and a spring portion 126 which supports the contact portion 122 so that the contact portion 122 is displaceable in an up-down direction. The contact portions 122 of the contacts 120 are arranged in a pitch direction (X direction), and reinforcement portions 166 are positioned between the contact portions 122, respectively. The structure reinforces a side portion of the contact portion 122. Therefore, even if the contact portion 122 receives a force along the pitch direction (X direction), damage of the contact 120 can be prevented.