A device for manufacturing a field pole magnet body that is to be installed in a rotating electric machine wherein the device is configured to integrate a plurality of magnet fragments into the field pole magnet body by bonding and aligning the magnet fragments, the magnet fragments being formed by cleaving and dividing a magnet body at a width direction, - by aligning and bonding the plurality of the magnet fragments in an aligned state with their cleaved surfaces facing each other in a lengthwise direction of alignment of the device; and - by pressing from the three directions of the thickness direction, the width direction, and the lengthwise direction of the magnet fragments; and wherein the device comprises: - a reference jig configured to position and align the plurality of magnet fragments by means of reference surfaces (51A, 51B, 51C) in the lengthwise direction, the width direction, and the thickness direction, whereby the lengthwise direction reference surface is comprised in the reference jig, the thickness direction reference surface is comprised in the reference jig, and the width direction reference surface is comprised in the reference jig, - a first pressing means arranged to oppose the thickness direction reference surface of the reference jig and configured to press the plurality of magnet fragments toward the thickness direction reference surface along the operational axis line of a pressing part of the first pressing means, and - a second pressing means arranged to oppose the width direction reference surface of the reference jig and configured to press the plurality of magnet fragments toward the width direction reference surface along the operational axis line of a pressing part of the second pressing means, wherein the operational axis line of the pressing part (54B, 55B) of at least one of the first and second pressing means (54, 55) is arranged to be tilted such that a tip (54C, 55C) of the first and/or second pressing means (54, 55) is tilted toward the lengthwise direction reference surface of the reference jig. - by aligning and bonding the plurality of the magnet fragments in an aligned state with their cleaved surfaces facing each other in a lengthwise direction of alignment of the device; and - by pressing from the three directions of the thickness direction, the width direction, and the lengthwise direction of the magnet fragments; and - a reference jig configured to position and align the plurality of magnet fragments by means of reference surfaces (51A, 51B, 51C) in the lengthwise direction, the width direction, and the thickness direction, whereby the lengthwise direction reference surface is comprised in the reference jig, the thickness direction reference surface is comprised in the reference jig, and the width direction reference surface is comprised in the reference jig, - a first pressing means arranged to oppose the thickness direction reference surface of the reference jig and configured to press the plurality of magnet fragments toward the thickness direction reference surface along the operational axis line of a pressing part of the first pressing means, and - a second pressing means arranged to oppose the width direction reference surface of the reference jig and configured to press the plurality of magnet fragments toward the width direction reference surface along the operational axis line of a pressing part of the second pressing means,