PURPOSE: To simplify structure and improve reliability by covering image sensor elements and their adjacent interfaces and electric connection parts by an organic polymeric material.

CONSTITUTION: A glass/epoxy laminated plate is used as an insulator substrate 1, and a conductor pattern 4 and a hole 3, having a size capable of surrounding a line sensor element 2 fabricated from quartz, are provided on the surface of the substrate 1. A polyester film 6, on whose surface a silicon adhesive 5 is applied as a material for fixing the insulator substrate and the line sensor element, is used to bond and fix a line sensor element, consisting of two line sensor elements 2 connected together into one by a fused quartz rod 9 on which an ultraviolet curing adhesive 5 is applied, and the insulator substrate onto the surface of the film 6. The line sensor element and the insulator substrate are connected via an aluminum wire 7 for electric conduction. Further, the atmosphere is kept at a temperature not lower than 40°C during the curing.