A first light-blocking member (10) and a second light-blocking member (30) are adhered to each other by forming a light-transmitting layer having a light-transmitting composition (21) serving as a base material and a light-transmitting filler (22) different in index of refraction from this light-transmitting composition (21) on a front surface of the first light-blocking member (10), applying a liquid light curing adhesive to a front surface (20a) of the light-transmitting layer (20), arranging the second light-blocking member (30) on the front surface (20a) of the light-transmitting layer (20) to which the liquid light curing adhesive has been applied, curing the liquid light curing adhesive by irradiating the light-transmitting layer (20) with light having a prescribed wavelength laterally from a side of the light-transmitting layer (20) so as to adhere the light-transmitting layer (20) and the second light-blocking member (30) to each other. By doing so, in adhering the light-blocking members to each other by using a light curing adhesive, an adhesion operation can easily and quickly be performed while ensuring sufficient adhesion strength.