The present invention is a line roller unit that includes a line roller, a bearing, a cylindrical member, and a first magnetic seal. The line roller possesses a guider on its periphery surface that guides a fishing line. The bearing is set up on the inner circumference of the line roller, with the cylindrical member possessing a holding part that holds bearing. The cylindrical member is set up on the inner circumference of bearing. The first magnetic seal possesses both a first magnet and a first holding member that holds the first magnet, and the first magnetic seal forms the first magnetic circuit for holding the magnetic liquid at the space between the cylindrical member. The first magnetic seal is set up on the line roller.