A holder with a harness includes: a bearing member, a stopper, a supporting member, and the harness. The bearing member has a flat surface, a local area of the surface includes magnetic attraction area, and magnets are disposed in the bearing member to generate a magnetic force in the magnetic attraction area. The stopper is pivotally connected to the bearing member, and the stopper protrudes from the surface after being cocked up. The supporting member is pivotally connected to an edge of the bearing member and keeps an angle between the bearing member and the supporting member after being adjusted. The harness includes a flexible bent strap, and at least one end of the harness is coupled to the supporting member, such that the supporting member and the harness enclose to form a ring shape.