To provide an adjusting method and an adjusting device for a contact type image sensor which enable adjustment of a rod lens to a proper position without any troublesome operation when the MTF adjustment of the contact type image sensor is made.

This adjusting method for the contact image sensor module uses a pattern guide 3 having positive side test pattern display parts 3A and 3C which are put away from a read sensor S at a specified distance from the best focus position O-O from the read sensor S and a negative side test pattern display part 3B which is put close to the read sensor S by a specified distance from the best focus position from the read sensor S when set at a specified position for the contact type image sensor module M.