To provide a housing, an electric device, and a method of assembling the housing that can make welding marks inconspicuous and suppress an increase in manufacturing cost.SOLUTION: A housing includes a base portion and a cover portion 30 joined to the base portion so as to overlap in the first direction Z. The cover 30 includes a first portion 31 and a second portion 32 having a light transmittance higher than that of the first portion 31. The first portion 31 and the second portion 32 are alternately arranged along a second direction X orthogonal to the first direction Z when viewed from the first direction Z.SELECTED DRAWING: Figure 4【課題】溶着痕を目立ちにくくし、製造コストの増加を抑制可能な筐体、電気装置および筐体の組立方法を提供する。【解決手段】筐体は、ベース部と、第１方向Ｚに重なるようにベース部に接合されるカバー部３０と、を備える。カバー部３０は、第１部分３１および第１部分３１よりも光の透過率が高い第２部分３２を含む。第１部分３１と第２部分３２とは、第１方向Ｚから見て、第１方向Ｚと直交する第２方向Ｘに沿って交互に配置される。【選択図】図４
