PROBLEM TO BE SOLVED: To improve waterproof effects as well as the electric connection by inserting a flexible printed circuit board in an electronic medical apparatus.SOLUTION: An inner circuit board 5 within a casing body 120 is arranged in parallel with the bottom surface of an opening 142 of a side wall 140. A lock holder 160 is arranged on the inner circuit board 5 in the way that it is movable to separate from and come into contact with the board 5, and that it can push the flexible circuit board 3 inserted into the casing body 120 is pushed onto the circuit board 5 to come into contact with both the inner circuit board 5 and the bottom surface of the opening 142 via a rubber packing 164. The lock lever 150 is provided at the external surface of the side wall 140 of the casing body 120 in the way that it can separate from and come into contact with that external surface, and has a hole 152 communicating with an opening 142 and has the flexible printed circuit board 3 inserted through it. The lock lever 150 contacts the external surface of the side wall 140 and blocks the space between the opening 142 and the tip 162 of the lock holder 160 in the opening 142 with a rubber packing 156.COPYRIGHT: (C)2009,JPO&INPIT【課題】フレキ板を挿入して電気的な接続を容易に行うことができ、防滴効果を向上させること。【解決手段】ケース本体120内の基板5は、一側壁部140の開口部142の下面に沿って配設されている。ロックホルダ160は、基板5上で当該基板5に接離方向に移動自在に配置され、ケース本体120内に挿入されるフレキ板3を、ゴムパッキン164を介して、基板5側に押圧して、基板5及び開口部142の下面に圧接する。ロックレバ150は、ケース本体120の一側壁部140の外面側に、外面と接離自在に設けられ、開口部142と連通しフレキ板3が挿入される連通孔152を有する。ロックレバ150は、一側壁部140の外面に当接して開口部142と開口部142内のロックホルダ160の先端部162との間をゴムパッキン156を介して閉塞する。【選択図】図2