Patent ID: 7764152

Claim:
A contact structure comprising: a plurality of contactors for establishing electric contact with devices under test when testing the devices under test by means of contacting a contact provided at the devices under test, and a contact board mounting said plurality of contactors on its surface, wherein each of said plurality of contactors includes: a base part formed with a step difference, a plurality of support parts, each of the plurality of support parts having a rear end side provided at the base part and a front end side sticking out from the base part, wherein said plurality of support parts are arranged on said base part at predetermined intervals, and a conductive part formed at the surface of at least one of the plurality of support parts and electrically contacting the contact, wherein an angle part of the step difference formed at the base part contacts the surface of the contact board mounting the plurality of contactors so as to thereby define a predetermined inclination angle between the surface of the contact board and each of the plurality of support parts, and wherein said devices under test are electrical circuits formed on a semiconductor wafer, and said contact board has a heat expansion coefficient (α 1 )satisfying the following equation (1): α1=α2×Δ t 2/Δ t 1 equation (1) where, in the above equation (1), α 1 is a heat expansion coefficient of said contact board, Δt 1 is a rising temperature of said contact board at the time of a test, α 2 is a heat expansion coefficient of said semiconductor wafer, and Δt 2 is a rising temperature of said semiconductor wafer at the time of the test.