a movable member which magnetically retains the stop member when in contact with it the casing includes a guide recess for guiding a yolk portion of the movable member to permit tilting of the yolk portion a spring biases the movable member to a position outward of the casing a rod fixed to the casing has an end guided by the movable member so as to cause the yolk portion of the movable member to tilt when the door is being opened due to movement of the rod relative to the movable member as the yolk portion tilts the magnetic contact area is greatly reduced and separation of the yolk portion from the stop member is facilitated application_number US 68365284 A description the present invention will now be described in detail referring to embodiments shown in the attached drawings in fig1 reference number 1 denotes a magnet catcher 2 a movable body and 3 a case into which the movable body 2 is fitted in a freely slidable manner all of these components are made of synthetic resin the movable body 2 is of square column shape and a magnet attaching hole 4 is bored on the front portion whereas a spring attaching rod.