Safety door switch

A safety door switch comprising:

• a metallic casing integrated as a first part of an enclosure, having an opening in a front side;
• a cover integrated as a front part of the enclosure, covering the opening, the cover having a surface as a front surface of the enclosure;
• a wireless means disposed in the enclosure, for wirelessly supplying electric power to a wireless tag and receiving a signal including identification information from the wireless tag through the cover;
• a determination means disposed in the enclosure, for determining whether a predetermined wireless tag exists in a reference range or not in accordance with identification information included in the signal received from the wireless tag by the wireless means and an intensity of the signal received from the wireless tag;
• an output means disposed in the enclosure, for outputting a safety signal based on a determination result of the determination means;
• one or more circuit substrates provided inside the metallic casing and the cover, on which the wireless means, the determination means and the output means are mounted;
• and
• attachment holes formed on a side surface of the metallic casing, the side surface being adjacent to the front surface of the enclosure for attaching the casing.