Patent ID: 8213182

Claim:
A housing case for housing an electronic circuit board, comprising: a lower case portion which internally houses a circuit board mounting electronic components, the lower case portion including a lower case planar portion and lower case sidewall portions which stand from a peripheral edge of the lower case planar portion, the lower case planar portion and lower case sidewall portions formed by using a plate-like member made of a metal material; and an upper case portion which is externally fitted to said lower case portion to form a box-like member, the upper case portion including an upper case planar portion and upper case sidewall portions which stand from a peripheral edge of the upper case planar portion, the upper case planar portion and upper case sidewall portions formed by using a plate-like member made of a metal material, wherein said lower case sidewall portions each include a planar face having an engaging projection disposed thereon and projecting outwardly therefrom, said upper case sidewall portions each include a planar face having an engaging hole defined therethrough, said engaging holes disposed in said upper case sidewall portions in positions corresponding to said lower case engaging projections, said upper case portion is externally fitted to said lower case portion such that said upper case planar portion faces said lower case planar portion, and said lower case engaging projections are received in and engage said upper case engaging holes, whereby said lower case portion and said upper case portion are fixed to each other, said lower case sidewall portions have an inwardly bent first part of tip end portions formed as urging force generating portions, and a second part of said tip end portions formed so as to be lower in height from said lower case planar portion than said urging force generating portions, and said inwardly bent first part of tip end portions of said lower case sidewall portions are provided to directly contact, butt against and slide over said upper case planar portion to be further bent, thereby generating an urging force when said upper case portion is externally fitted to said lower case portion.