Medium feed device and recording device

A medium feed device comprising:

• a placement section configured to have a medium placed thereon;
• a feed roller configured to feed, in a feeding direction, the medium placed on the placement section;
• a drive source of the feed roller;
• a drive shaft that is a shaft configured to transmit drive force of the drive source to the feed roller, that extends along a width direction intersecting the feeding direction, that has a free end;
• and
• a support member configured to rotatably support the feed roller, wherein
• the feed roller is provided at the free end of the drive shaft,
• a direction that is along an axial direction of the drive shaft and that is from a base end side of the drive shaft toward the free end is defined as a first direction, and a direction opposite to the first direction is defined as a second direction,
• the feed roller is configured to be displaceable along the axial direction between an attached position and an attachment and detachment position that is located in the second direction with respect to the attached position, and
• in a state where the feed roller has been moved from the attached position to the attachment and detachment position, an attachment and detachment direction of the feed roller is a direction intersecting the axial direction.