A motor-driven compressor, comprising: a shell; an electric motor provided in the shell; a connector (40U, 40V, 40W) provided in the shell; a first conductor (35U, 35V, 35W) electrically connected to the connector (40U, 40V, 40W) and extending through and out of the shell to be connected to a power source; a second conductor (39U, 39V, 39W) electrically connected to the connector (40U, 40V, 40W) and the electric motor; and a connector case receiving the connector (40U, 40V, 40W), wherein the connector case includes a first case member and a second case member, a seal member is provided between the first and second case members (42, 43), the first case member has a first sealing surface (64, 56, 58, 451, 452, 57, 59) extending along the periphery of the first case member, the second case member has a second sealing surface (66, 60, 62, 501, 502, 61, 63) extending along the periphery of the second case member and facing the first sealing surface (64, 56, 58, 451, 452, 57, 59), the seal member includes a main seal portion for sealing between the first sealing surface (64, 56, 58, 451, 452, 57, 59) and the second sealing surface (66, 60, 62, 501, 502, 61, 63), the main seal portion has a first peripheral seal portion (69, 71, 80, 81) for sealing the periphery of the first conductor (35U, 35V, 35W) inserted therethrough and has a second peripheral seal portion (70, 72, 73) for sealing the periphery of the second conductor (39U, 39V, 39W) inserted therethrough; and wherein the main seal portion has a first side seal portion connecting one end of the first peripheral seal portion (69, 71, 80, 81) to one end of the second peripheral seal portion (70, 72, 73) and has a second side seal portion connecting the other end of the first peripheral seal portion (69, 71, 80, 81) to the other end of the second peripheral seal portion (70, 72, 73), characterized in that the second peripheral seal portion (70, 72, 73) has a base portion (70, 72) formed continuous with the first and second side seal portions (79, 78) and has a strip portion connected to one end of the base portion (70, 72) through the connecting portion, the strip portion is folded at the connecting portion over the base portion (70, 72) so that the second conductor (39U, 39V, 39W) is held between the base portion (70, 72) and the strip portion; and the strip portion and the base portion (70, 72) each has the semi-cylindrical portion (75, 70), the strip portion is folded over the base portion (70, 72) so that the semi-cylindrical portion of the strip portion faces the semi-cylindrical portion of the base portion (70, 72), the opposite semi-cylindrical portions (70, 75) cooperate to form a cylindrical portion through which the second conductor (39U, 39V, 39W) is inserted. a shell; an electric motor provided in the shell; a connector (40U, 40V, 40W) provided in the shell; a first conductor (35U, 35V, 35W) electrically connected to the connector (40U, 40V, 40W) and extending through and out of the shell to be connected to a power source; a second conductor (39U, 39V, 39W) electrically connected to the connector (40U, 40V, 40W) and the electric motor; and a connector case receiving the connector (40U, 40V, 40W), wherein the connector case includes a first case member and a second case member, a seal member is provided between the first and second case members (42, 43), the first case member has a first sealing surface (64, 56, 58, 451, 452, 57, 59) extending along the periphery of the first case member, the second case member has a second sealing surface (66, 60, 62, 501, 502, 61, 63) extending along the periphery of the second case member and facing the first sealing surface (64, 56, 58, 451, 452, 57, 59), the seal member includes a main seal portion for sealing between the first sealing surface (64, 56, 58, 451, 452, 57, 59) and the second sealing surface (66, 60, 62, 501, 502, 61, 63), the main seal portion has a first peripheral seal portion (69, 71, 80, 81) for sealing the periphery of the first conductor (35U, 35V, 35W) inserted therethrough and has a second peripheral seal portion (70, 72, 73) for sealing the periphery of the second conductor (39U, 39V, 39W) inserted therethrough; and wherein the main seal portion has a first side seal portion connecting one end of the first peripheral seal portion (69, 71, 80, 81) to one end of the second peripheral seal portion (70, 72, 73) and has a second side seal portion connecting the other end of the first peripheral seal portion (69, 71, 80, 81) to the other end of the second peripheral seal portion (70, 72, 73), characterized in that the second peripheral seal portion (70, 72, 73) has a base portion (70, 72) formed continuous with the first and second side seal portions (79, 78) and has a strip portion connected to one end of the base portion (70, 72) through the connecting portion, the strip portion is folded at the connecting portion over the base portion (70, 72) so that the second conductor (39U, 39V, 39W) is held between the base portion (70, 72) and the strip portion; and the strip portion and the base portion (70, 72) each has the semi-cylindrical portion (75, 70), the strip portion is folded over the base portion (70, 72) so that the semi-cylindrical portion of the strip portion faces the semi-cylindrical portion of the base portion (70, 72), the opposite semi-cylindrical portions (70, 75) cooperate to form a cylindrical portion through which the second conductor (39U, 39V, 39W) is inserted.