Patent ID: 7884974

Claim:
An image sensor unit comprising: an image sensor that emits light to an object and outputs an electrical signal in accordance with light reflected by the object; and a retention member that retains the image sensor, wherein the image sensor comprises: a case that extends in a longitudinal direction; and a first positioning member that is disposed at one end portion in the longitudinal direction of the case, wherein the retention member comprises: a frame that extends in the longitudinal direction; and a second positioning member that is disposed at one end portion in the longitudinal direction of the frame, and wherein the case is positioned relative to the frame in the longitudinal direction by engaging the first positioning member with the second positioning member, wherein supported portions are provided at both ends in the longitudinal direction of the case, wherein each of the supported portions includes one of a shaft portion and a bearing portion, and wherein the first positioning member is provided at one of the supported portions.