Contact block and electrical connecting apparatus

An electrical connecting apparatus comprising a contact block comprising a plurality of contacts including a pair of contact pieces spaced from each other, and an electrically insulating combining block for combining said contact pieces, wherein said combining block combines said contacts such that said contacts are spaced apart in one direction, wherein each contact piece is provided with:

• a horizontal U-shaped or a horizontal V-shaped intermediate region having a folded end portion which is folded back and a pair of arm portions extending at a vertical interval from said folded end portion;
• a first tip region extending downward from the tip portion of one of said arm portions;
• and a second tip region extending upward from the tip portion of the other arm portion, and wherein said folded end portions of both contact pieces are buried in said combining block, and the remaining parts of both contact pieces are proiected from said combining block;
• first and a second plate-like members overlapping each other and forming a space for accommodating the contact block;
• an attachment for attaching said contact block to said first or second plate-like member, wherein said first plate-like member is provided with a plurality of long holes receiving both first tip regions of said contact, said long holes being disposed at intervals in a direction intersecting the longitudinal direction of said arm portion and extending in the longitudinal direction of said arm portion, and wherein said second plate-like member is provided with an opening for receiving a device under test, and a plurality of second long holes in which said second tip regions of said contacts are received, said second long holes being disposed at intervals in a direction interesting the longitudinal direction of said arm portion and extending in the longitudinal direction of said arm portion.