| 摘要 |
PROBLEM TO BE SOLVED: To provide a window for crime prevention which is slid to be opened and closed and causes no damage to a magnet piece nor a reed switch even though a door is opened and closed. SOLUTION: A magnet piece 4 is embedded inside the sash for member 31 of a door 3, and a reed switch 5 that senses the change in magnetic field in the neighborhood of an indoor side position facing the piece 4 embedded in the member 31 when the door 3 is closed in provided in a window frame 2 and a stopper 6 projecting from the switch 5 is provided on a contact surface in the neighborhood of the switch 5 on which the indoor door 3 abuts.
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