To provide an electrode cap which can adjust a cap body according to the size and shape of a human head, and also has good appearance. An electrode cap includes a cap body, a base body, a fitting portion, and a probe electrode. The cap body 1 can be molded according to the shape of a human head and has a right engaging portion 10 and a left engaging portion 11. On the upper edge joining surface of the right engaging portion 10 and the left engaging portion 11, a concave tank and an annular hollow convex portion engaging with each other are respectively provided. The right engaging portion 10 has a right engaging portion upper housing 101 and a right engaging portion lower housing 102. The left engaging portion 11 has a left engaging portion upper housing 111 and a left engaging portion lower housing 112. In the right engaging portion lower housing 102, the connecting rod is disposed in the recessed tank and is penetrated into the hollow projecting portion to be in a bearing state. The left engaging portion lower housing 112 is provided with a left engaging portion lower housing hook portion for hooking the extension and retraction spring. (FIG.【課題】人の頭部のサイズ・形状に応じてキャップ体を調整することができる上、見た目も良い電極キャップを提供する。【解決手段】電極キャップはキャップ体1、ベースボディ2、嵌着部3及びプローブ電極4を備える。キャップ体1は人の頭部の形状に合わせて成形可能であるとともに、右係合部10及び左係合部11を有する。右係合部10及び左係合部11の上縁接合面には互いに係合する凹槽及び環状中空凸部がそれぞれ設けられる。右係合部10は右係合部上ハウジング101及び右係合部下ハウジング102を有する。左係合部11は左係合部上ハウジング111及び左係合部下ハウジング112を有する。右係合部下ハウジング102は連杆が凹槽内に配設されるとともに、中空凸部内に貫通されて軸受状態にある。左係合部下ハウジング112には伸縮ばねを掛止する左係合部下ハウジングフック部が設けられる。【選択図】図1
