A terminal block is disclosed having a leaf spring, a contact, a cam member, and a spring member. The contact is positioned adjacent to the leaf spring and has a contact seat. The contact seat has a projection extending towards the leaf spring and is positionable in a hole of a ring terminal inserted into the terminal block. The cam member is in rotatable contact with the leaf spring, has a rotational axis extending in a direction of insertion of the ring terminal, and when in contact with the leaf spring, presses the leaf spring against the contact. The spring member is located closer to the leaf spring than the contact seat and biased against the inserted ring terminal.