PROBLEM TO BE SOLVED: To provide an attachable/detachable boxed water glass capable of securing a fixed visual field for safety to maneuvering, grippable surely, and tiltable to various angles against a tidal force.SOLUTION: When being gripped by an attaching/detaching device 100, a boxed water glass 200 can be guided easily to a desired attached position by a first guide member 4 or a fourth guide member, and when being attached, the boxed water glass is hardly detached from the attaching/detaching device 100 by regulating movement of the boxed water glass 200 within a fixed range by a first abutting member or a second abutting member.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】操船に対する安全のために一定の視野が確保され，確実な把持が出来ると共に，潮力に抗して様々な角度に傾けることが出来る着脱自在の箱めがねを提供する。【解決手段】箱めがね２００は着脱装置１００により把持される際、第１案内部材４乃至第４案内部材により、所望の装着位置へ誘導しやすく、かつ装着時には第１当接部材乃至第２当接部材により箱めがね２００の動きを一定の範囲に規制することにより着脱装置１００から外れにくいことを特徴とする。【選択図】図１
