To provide an optical touch panel with reduced noise in a light receiving element.

Each of light emitting and receiving packages 3X"-a, 3X"-b, 3Y"-a and 3Y"-b has the same configuration, and comprises: a vertically placed light emitting element, for example, an LED element 31; and a light receiving element, for example, a phototransistor 32. Thus, objects A, B, C and D can be detected by using reflection photo-interrupter technology. For example, light L_X1 emitted from the LED element 31 of the light emitting and receiving package 3X"-a is reflected by the object A on a display surface and reaches the phototransistor 32 of the package 3X"-a, and light L_Y1 emitted from the LED element 31 of the light emitting and receiving package 3Y"-a is reflected by the object A on the display surface and reaches the phototransistor 32 of the package 3Y"-a. This allows for determination whether or not the object A exists at coordinates (X1,Y1) by the presence or absence of the reflection light L_X1 and L_Y1.