A medium transport apparatus includes a transport roller configured to transport a medium and a roller support portion configured to support the transport roller. The roller support portion includes a support member contacting an outer circumferential surface of the transport roller at two positions thereof in a circumferential direction to support the transport roller, a base member defining a position of the support member, and an intermediary member mediating the support member and the base member. The intermediary member is configured to cause separation between the support member and the base member without moving the support member and the base member.

A medium transport apparatus includes a transport roller configured to transport a medium and a roller support portion configured to support the transport roller. The roller support portion includes a support member contacting an outer circumferential surface of the transport roller at two positions thereof in a circumferential direction to support the transport roller, a base member defining a position of the support member, and an intermediary member mediating the support member and the base member. The intermediary member is configured to cause separation between the support member and the base member without moving the support member and the base member.