Patent ID: 8172625

Claim:
A pair of mutually connectable terminals, comprising: one terminal provided with a joint having a spherical surface formed on the outer circumferential surface; and the other terminal provided with a hole into which the joint can be fitted; wherein a plate member is formed at least one of the one terminal and the other terminal; wherein at least one of the joint and the hole is formed in the plate member which can be displaced elastically in a fitting direction of the joint and the hole; when connecting the pair of terminals, the joint touches the circumferential edge of the hole to displace the plate member elastically, and when the joint is fitted in the hole, the plate member is restored elastically and holds the spherical surface of the joint under such a state as the spherical surface is pressed against the edge of the hole; wherein the hole is formed in the plate member, in which a guide groove for guiding the joint is formed from the front end edge in a connecting direction relative to the one terminal to the hole, and wherein the guide groove is formed to gradually increase its width toward the hole from the front end edge in the connecting direction.