METHOD FOR TESTING CONTAINER SEALING AND ASSISTANCE DEVICE

Provided is a highly reliable method for inspecting a sealing performance of a container and an auxiliary apparatus with which some of the steps of the inspection method can be executed without requiring skills. Provided is a method for inspecting a sealing performance of a mouth portion of a container and a cap including a resin outer seal and a resin inner seal that are formed on an inner surface of a top face portion, and the inspection method includes a first drilling step of forming, in the top face portion included in the cap screwed on the mouth portion of the container, a first hole that is in communication with a first space defined by a circumferential edge portion of the mouth portion and the inner seal and the outer seal, a first injecting step of injecting a dye into the first space, a first leaving step of leaving the container in which the dye has been injected into the first space, a first checking step of checking whether or not the dye leaks into the container in which the dye has been injected into the first space, and an evaluating step of evaluating sealing performance.