A medical treatment and surgical operation table comprising: a table which is formed of a material through which an X-ray transmits and on which a patient lays; an operation unit that supports a lower side of one end portion of the table and includes: an elevating mechanism for vertically elevating the table, an inclining mechanism for freely inclining the table, and a horizontally movable mechanism for moving the table in the horizontal direction, wherein the horizontally movable mechanism comprises vertical guide rails slidably supported by corresponding vertical guide rail support members, and horizontal guide rails slidably supported by corresponding horizontal guide rail support members; a base that supports the operation unit; and fixing/releasing means configured to fix a movement of the table or to release the fixing of the table, the fixing/releasing means comprising a first fixing/releasing mechanism and a second fixing/releasing mechanism, wherein the first fixing/releasing mechanism comprises a permanent magnet and a coil arranged around the permanent magnet, wherein by applying a current to the coil, the magnetic force of the permanent magnet is neutralized, thereby releasing the fixing of the table to be movable, wherein the second fixing/releasing mechanism comprises a motor including a rotating shaft, a cam movable by a rotation of the rotating shaft, a pin engaged with an inclination surface of the cam, and a push member for pushing at least one side surface of the guide rails (51, 54), wherein when the motor is driven, the rotating shaft of the motor is expanded to thereby move the cam and to thereby push the push member against one side surface of the guide rails (51, 54) by the pin, thereby fixing the movement of the guide rails (51, 54), and when the cam is moved to the original position by reverse rotation of the motor, the push member is separated from the side surface of the guide rails (51, 54), thereby releasing the fixing of the table, wherein the second fixing/releasing mechanism has a fixing force for fixing the movement of the table that is larger than that of the first fixing/releasing mechanism, wherein when the table is in a horizontal position, the table is held fixed by the first fixing/releasing mechanism and is released only at a time of operating a button for releasing, wherein the second fixing/releasing mechanism is controlled so that it is released at a time when the table takes the horizontal position and is automatically fixed only at a time when the table is inclined. a table which is formed of a material through which an X-ray transmits and on which a patient lays; an operation unit that supports a lower side of one end portion of the table and includes: an elevating mechanism for vertically elevating the table, an inclining mechanism for freely inclining the table, and a horizontally movable mechanism for moving the table in the horizontal direction, wherein the horizontally movable mechanism comprises vertical guide rails slidably supported by corresponding vertical guide rail support members, and horizontal guide rails slidably supported by corresponding horizontal guide rail support members; a base that supports the operation unit; and fixing/releasing means configured to fix a movement of the table or to release the fixing of the table, the fixing/releasing means comprising a first fixing/releasing mechanism and a second fixing/releasing mechanism, wherein the first fixing/releasing mechanism comprises a permanent magnet and a coil arranged around the permanent magnet, wherein by applying a current to the coil, the magnetic force of the permanent magnet is neutralized, thereby releasing the fixing of the table to be movable, wherein the second fixing/releasing mechanism comprises a motor including a rotating shaft, a cam movable by a rotation of the rotating shaft, a pin engaged with an inclination surface of the cam, and a push member for pushing at least one side surface of the guide rails (51, 54), wherein when the motor is driven, the rotating shaft of the motor is expanded to thereby move the cam and to thereby push the push member against one side surface of the guide rails (51, 54) by the pin, thereby fixing the movement of the guide rails (51, 54), and when the cam is moved to the original position by reverse rotation of the motor, the push member is separated from the side surface of the guide rails (51, 54), thereby releasing the fixing of the table, wherein the second fixing/releasing mechanism has a fixing force for fixing the movement of the table that is larger than that of the first fixing/releasing mechanism, wherein when the table is in a horizontal position, the table is held fixed by the first fixing/releasing mechanism and is released only at a time of operating a button for releasing, wherein the second fixing/releasing mechanism is controlled so that it is released at a time when the table takes the horizontal position and is automatically fixed only at a time when the table is inclined.