To prevent an ordinary monitoring row from approaching the doorway too much, when adjusting a doorway monitoring row, in a reflection type sensor for an automatic door for arranging and setting one of its monitoring rows on the doorway as the doorway monitoring row, by setting a plurality of monitoring rows parallel to the moving direction of the door, by irradiating the spotlight in a matrix shape to a floor surface in the vicinity of the automatic door including a doorway part.

This reflection type sensor has an adjusting mode used when setting the doorway monitoring row WL1 in the doorway DW part and an operation mode of validating all the monitoring rows including the doorway monitoring row WL1 and the ordinary monitoring rows WL2 to WL4, and validates only the ordinary monitoring row WL2 adjacent just near the doorway monitoring row WL1 in the adjusting mode.

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