IRRADIATED LIGHT DETECTING DEVICE

PROBLEM TO BE SOLVED: To make the shifting work of a light receiving section which receives and detects irradiated laser light easier and to improve the accuracy of the section by displaying the irradiating light receiving position of the light receiving section against a reference position and making an index section having position indexes based on the reference position slidable. SOLUTION: A position which becomes a reference position when the laser light emitted from a rotary laser device scans the middle of the bisected light receiving elements of a light receiving section 112 is displayed 124 in a displaying section 116. When the upward or downward light receiving element of the light receiving section 112 is scanned, an upward arrow 122 or downward arrow 120 is displayed in the displaying section 116 and the main body of an irradiating light detecting device 100 is moved upward or downward so that the position of the main body may become a reference position. The notch 140 of a sliding cursor 132 becomes the index of the sliding position of the cursor 132 and the pointer 142 of the cursor 132 indicates the sliding amount of the cursor 132 on a scale 134. Therefore, the shifting position of the cursor 132 can be set efficiently with high accuracy on the basis of reference irradiated light.