A solid-state imaging element has problems of occurrence of dark current due to influences of an interface state at an interface between a semiconductor and an insulating film, e.g., between silicon and silicon oxide, and of charges generated in a device manufacturing process, which leads to signal noise, thereby degrading the function of a device, specifically, the imaging quality. The outline of the invention in the present application relates to a manufacturing method of a semiconductor integrated circuit device with a surface-irradiation type image sensor, which includes irradiating a main surface of a semiconductor wafer with photodiodes formed therein, with far-ultraviolet ray after forming a lowermost wiring layer of a multi-layer wiring and before forming a color filter layer, and then applying a heat treatment to the wafer.