PURPOSE: To detect diffused reflection or retroreflection in an optical detecting device by reading a planar substrate having a novel, optical and geometrical graphic concerning an optical scanning and reading device.

CONSTITUTION: The device is the optical scanning and reading device of an object having a readable mark and is constituted by providing a housing means 42, a light emitting means 48 positioned in the housing means 42 so as to provide an optical beam, a means 62 positioned in the housing means 42 so as to give a direction to the light beam along a route which prevents the position of the object to be scanned, a light receiving detecting means 77 positioned in the housing means 42 and a condensing means 60 permits the detecting means 77 to receive the light of non-positive reflection from the object by permitting positive reflection light from the object to be scanned, which is received by the detecting means 77, to be min.