An adsorption force confirmation device of a mold handling device provided with a magnetic clamping device (10, 20) having a magnetizing coil, a reversible magnet whose magnetic poles are reversed according to a direction of electric current flowing in the magnetizing coil, and a non-reversible magnet on each of opposite plates proximate to or separated from each other, in which a mold (M1, M2) is adsorbed and fixed to the plates by magnetic force of the reversible magnet and magnetic force of the non-reversible magnet, comprising: an ignition circuit for controlling an amount of electric current of the magnetizing coil; a sensor coil (17, 44) for measuring adsorption force of the magnetizing coil; and a controller for controlling the magnetic clamping device (10, 20) or the mold handling device, wherein the controller is configured to control the electric current of the magnetizing coil with the ignition circuit so that the magnetic clamping device (10, 20) exerts magnetic adsorption force weaker than normal magnetization, and to conduct a test whether the mold (M1, M2) peels from the plates by separating opposing platens (2, 3) after operating the mold handling device, and when detecting pealing, to issue a warning to an operator that adsorption force cannot be guaranteed, and otherwise, to control the electric current of the magnetizing coil with the ignition circuit so that the magnetic clamping device (10, 20) exerts the magnetic adsorption force by the normal magnetization, and wherein the controller is configured to determine whether the mold (M1, M2) is a mold for which the test has already been conducted, as a result of the determination, in a case of the mold (M1, M2) that has not been subjected to the test, to conduct the test and to measure and store magnetic adsorption force with the sensor coil during the test, and as a result of the determination, in a case of the mold (M1, M2) that is a mold for which the test has already been conducted, to conduct a normal magnetizing, to measure magnetic adsorption force with the sensor coil at that time and to compare with the magnetic adsorption force during the test, then in a case that the measured magnetic adsorption force is less than the magnetic adsorption force during the test, to issue a warning to the operator that adsorption force cannot be guaranteed. an ignition circuit for controlling an amount of electric current of the magnetizing coil; a sensor coil (17, 44) for measuring adsorption force of the magnetizing coil; and a controller for controlling the magnetic clamping device (10, 20) or the mold handling device, wherein the controller is configured to control the electric current of the magnetizing coil with the ignition circuit so that the magnetic clamping device (10, 20) exerts magnetic adsorption force weaker than normal magnetization, and to conduct a test whether the mold (M1, M2) peels from the plates by separating opposing platens (2, 3) after operating the mold handling device, and when detecting pealing, to issue a warning to an operator that adsorption force cannot be guaranteed, and otherwise, to control the electric current of the magnetizing coil with the ignition circuit so that the magnetic clamping device (10, 20) exerts the magnetic adsorption force by the normal magnetization, and wherein the controller is configured to determine whether the mold (M1, M2) is a mold for which the test has already been conducted, as a result of the determination, in a case of the mold (M1, M2) that has not been subjected to the test, to conduct the test and to measure and store magnetic adsorption force with the sensor coil during the test, and as a result of the determination, in a case of the mold (M1, M2) that is a mold for which the test has already been conducted, to conduct a normal magnetizing, to measure magnetic adsorption force with the sensor coil at that time and to compare with the magnetic adsorption force during the test, then in a case that the measured magnetic adsorption force is less than the magnetic adsorption force during the test, to issue a warning to the operator that adsorption force cannot be guaranteed.