A conductive contact holder that holds a signal conductive contact for transmitting and receiving an electrical signal between a semiconductor integrated circuit being a test object and a circuit board on which a test circuit is mounted, and a ground conductive contact for supplying ground potential to the semiconductor integrated circuit, the conductive contact holder comprising: an insulating holder member (2, 3) that is made of an insulating material and includes a first insertion hole (22, 32) through which the signal conductive contact is directly inserted; and a conductive block member that is made of a conductive material and includes a second insertion hole through which the ground conductive contact is inserted in partial contact therewith, wherein the insulating holder member (2, 3) includes a first holder member and a second holder member that are stacked along a longitudinal direction of the first insertion hole (22, 32), with the conductive block member being located between the first and second holder members, the first holder member includes a base portion that is in contact with a top surface of the conductive block member and includes an insertion hole communicating with the second insertion hole to hold a part of the ground conductive contact, and the second holder member includes a base portion that is in contact with a bottom surface of the conductive block member and includes an insertion hole communicating with the second insertion hole to hold a part of the ground conductive contact, characterized in that the first holder member further includes a protruding portion protruding from a surface of the base portion that faces the second holder member, the second holder member further includes a protruding portion protruding from a surface of the base portion that faces the first holder member, side surfaces of the conductive block member are surrounded by the protruding portions (2c, 3c) of the holder members (2, 3), a top surface of the protruding portion of the second holder member is brought into contact with a bottom surface of the protruding portion of the first holder member when assembled, and the signal conductive contact is inserted through the first insertion hole (22, 32) over substantially the full length thereof, wherein the first insertion hole (22, 32) is formed in the protruding portions (2c, 3c) of the first and the second holder members (2, 3). an insulating holder member (2, 3) that is made of an insulating material and includes a first insertion hole (22, 32) through which the signal conductive contact is directly inserted; and a conductive block member that is made of a conductive material and includes a second insertion hole through which the ground conductive contact is inserted in partial contact therewith, wherein the insulating holder member (2, 3) includes a first holder member and a second holder member that are stacked along a longitudinal direction of the first insertion hole (22, 32), with the conductive block member being located between the first and second holder members, the first holder member includes a base portion that is in contact with a top surface of the conductive block member and includes an insertion hole communicating with the second insertion hole to hold a part of the ground conductive contact, and the second holder member includes a base portion that is in contact with a bottom surface of the conductive block member and includes an insertion hole communicating with the second insertion hole to hold a part of the ground conductive contact, characterized in that the first holder member further includes a protruding portion protruding from a surface of the base portion that faces the second holder member, the second holder member further includes a protruding portion protruding from a surface of the base portion that faces the first holder member, side surfaces of the conductive block member are surrounded by the protruding portions (2c, 3c) of the holder members (2, 3), a top surface of the protruding portion of the second holder member is brought into contact with a bottom surface of the protruding portion of the first holder member when assembled, and the signal conductive contact is inserted through the first insertion hole (22, 32) over substantially the full length thereof, wherein the first insertion hole (22, 32) is formed in the protruding portions (2c, 3c) of the first and the second holder members (2, 3).