To provide a lock device for mountain climbing which allows a user to further enjoy mountain climbing with an eased burden on the legs and waist by achieving a walking on up and down hills as easily as if walking on flat roads.

In this lock device for mountain climbing, a lock device made of metal integrally having a shoe bottom frame 6 and lock frames to be on each bottom or mountaineering boots is fixed on the bottom with buckles 5. The lock frame which has a lock frame 2C bendable longitudinally centered on a rotating shaft 1A enables the setting thereof to match the up hill or the down hill.