To provide a magnifier in which eye width adjustment can be performed and magnifier bodies can be exchanged so as to meet a user and which is wearable on wearing members other than a spectacle frame.

The magnifier 37 comprises: a holder 18 which is equipped with a mount part 22 provided with a clip 21 for attachably and detachably mounting the magnifier on the wearing member, such as the spectacle frame 20, and a holding part 25 connecting turnably in a vertical direction to the mount 22 and holding the support 1 for mounting the magnifier; and a pair of magnifier bodies 6 and 7 which are respectively attachably and detachably fixed by means of fixing mechanisms to respective supporting frames 2 and 3 of the support 1 for mounting the magnifier held by the holder 18. The supporting frames 2 and 3 have the spaces long in a horizontal direction so as to make the mounting positions of the eyepiece tubes of the magnifier bodies 5 and 7 adjustable in the horizontal direction and are so constituted that their at least one surface sides are formed to comply with the curved surfaces in which the arcs have the foci of the magnifying lens systems within the magnifier bodies 6 and 7 as centers and have heir focal lengths as radii.