Distance measurement device, distance measurement control method, and distance measurement control program

A non-transitory computer readable medium storing a program that causes a computer to execute a process to control a distance measurement device,

• the distance measurement device including a light receiving section that receives reflective light from a subject as a subject image through an image formation optical system, an emission unit that has a light emitting element emitting directional light which is light having directivity, and emits the directional light toward the subject on a different optical path from an optical path of the image formation optical system, a detection unit that detects variation exerted on the device, a first reduction unit that is any of a single mechanism and a subject image processing unit and reduces, based on a detection result of the detection unit, influence of variation of an optical axis of the image formation optical system on the subject image received as light by the light receiving section, and a second reduction unit that reduces variation of an optical axis of the directional light with respect to the subject based on the detection result of the detection unit,
• the process comprising:
• in a case of operating the first reduction unit and the second reduction unit included in the distance measurement device at the same time, controlling the first reduction unit and the second reduction unit to reduce variation of an irradiation position of the directional light in the subject image received as light by the light receiving section.