Locking mechanism, device connector, container connector, and connecting device

Provided are a locking mechanism, a device connector, a container connector, and a connecting device with which it is possible to prevent engagement from being released by a pull force while achieving improved operability. This locking mechanism 160a is provided with: a to-be-engaged part 78 of a container connector 20; and an engaging member 160 of a device connector 100. The engaging member 160 is provided with: an operating part 165; a fulcrum part 168 which is formed contiguously to the operating part 165 and which comes into contact with the container connector 20 when the operating part 165 is being pressed; an engaging part 161 which is formed contiguously to the fulcrum part 168 and which engages the to-be-engaged part 78; a deformation part 166 which is formed contiguously to the engaging part 161 and which moves the engaging part 161 by being bent as the operating part 165 gets pressed; and a fixation part 169 which is formed contiguously to the deformation part 166 and which is fixed to an edge of a hole 131.