An auxiliary contact mechanism for a magnetic contactor, the magnetic contactor having a main contact slide support member supporting a main contact and being slidably movable in a vertical direction, characterized in that the auxiliary contact mechanism comprising: a contact support member made of an electrical insulating material that supports a contact and has an axial recess portion formed at the center of the contact support member in a vertical direction with a blocked lower portion; a stationary contact position-fixedly supported by the contact support member; a movable contact having a circuit closing position in which the movable contact is in contact with the stationary contact and being movable to a circuit opening position in which the movable contact is separated from the stationary contact; a permanent magnet position-fixed to the contact support member and applying magnetic attractive force to restrain the movable contact so that the circuit closing position is maintained; a slide movable supporter coupled to the movable contact so as to be movable in a vertical direction in the axial recess portion together with the movable contact, being slidably movable together with the movable contact to make the movable contact be moved to the circuit opening position when pressing force acting downwardly by the main contact slide support member is received, and having a pressing projection portion formed at a position separated apart by a predetermined distance from the movable contact when in the circuit closing position and pushing the movable contact to release the movable contact from a restrained state after a predetermined delay time has passed during which the slide movable supporter is moved downwardly by the predetermined distance, when the slide movable supporter is moved downwardly upon receiving downward pressing force by the main contact slide support member, and an auxiliary opening spring that has one end portion supported by the slide movable supporter and the other end portion supported by the movable contact and provides elastic force to the movable contact in a direction in which the movable contact is separated from the stationary contact. a contact support member made of an electrical insulating material that supports a contact and has an axial recess portion formed at the center of the contact support member in a vertical direction with a blocked lower portion; a stationary contact position-fixedly supported by the contact support member; a movable contact having a circuit closing position in which the movable contact is in contact with the stationary contact and being movable to a circuit opening position in which the movable contact is separated from the stationary contact; a permanent magnet position-fixed to the contact support member and applying magnetic attractive force to restrain the movable contact so that the circuit closing position is maintained; a slide movable supporter coupled to the movable contact so as to be movable in a vertical direction in the axial recess portion together with the movable contact, being slidably movable together with the movable contact to make the movable contact be moved to the circuit opening position when pressing force acting downwardly by the main contact slide support member is received, and having a pressing projection portion formed at a position separated apart by a predetermined distance from the movable contact when in the circuit closing position and pushing the movable contact to release the movable contact from a restrained state after a predetermined delay time has passed during which the slide movable supporter is moved downwardly by the predetermined distance, when the slide movable supporter is moved downwardly upon receiving downward pressing force by the main contact slide support member, and an auxiliary opening spring that has one end portion supported by the slide movable supporter and the other end portion supported by the movable contact and provides elastic force to the movable contact in a direction in which the movable contact is separated from the stationary contact.