PROBLEM TO BE SOLVED: To provide a support structure of earmuffs, constructed by a small number of components, excellent in strength and durability, and easy to assemble without using an industrial tool or requiring a fine work.SOLUTION: A support structure F of earmuffs is characterized such that: a connection structure J for connecting a head band 10 and an ear cup 40 and rotating a position of an ear pad in the left/right direction and front/back direction includes a band joint 20 comprising a bearing part 22 formed in a connection part 21 rotatably attached to the end of the head band 10, and an opening part 23 provided so as to pass the bearing part 22 in a direction crossing the axial direction of the bearing part 22, and a cup joint 40 comprising an extension part 32 extended from an axial part 31 pivotally supported in the bearing part 22 and passing the opening 23 followed by being fixed to the ear cup 40 and fixation parts 6 and 9 for holding the axial part 31 engaged with the bearing part 22 are provided.
