A terminal body is made of a conductive, resilient strip extending while forming an annular fitting portion having a first diameter which is smaller than a diameter of a battery post. An operating member is fitted with both end portions of the strip so as to movable between a first position in which the strip is retained such that the annular fitting portion has a second diameter which is larger than the diameter of the battery post, against a restoring force of the resilient strip, and a second position in which the restoring force is released. The battery post is fitted into the annular fitting portion of the terminal body while placing the operating member in the first position. The operating member is placed in the second position, after the terminal body is fitted on the battery post.