Patent ID: 7868635

Claim:
A probe performing a test for conductivity of a conductive wiring in a hole which is a contact hole or a through hole provided in a circuit board, comprising: a long and elastically deformable leg portion; a bent portion which is provided on a tip side of the leg portion and extends to the circuit board; and a contact portion provided on a tip side of the bent portion to be brought into contact with the conductive wiring, with the elasticity possessed by the probe itself, wherein the contact portion is formed to be in a shape of an arc having a radius of curvature larger than a radius of the through hole so that the whole of contact portion is prevented from entering the through hole, wherein a length of the contact portion in a longitudinal direction is longer than a diameter of the through hole, wherein a contact surface of the contact portion which is brought into contact with the conductive wiring is given a rough shape like an abrasion mark extending in a direction to cross the longitudinal direction of the contact portion, and wherein the contact portion is slidable in the longitudinal direction when the contact portion is brought into contact with the conductive wiring.