Seal inspecting device and container inspecting method

The present invention relates to a seal inspection device for inspecting seals of a container. Specifically, according to an embodiment of the present invention, provided is the seal inspection device for inspecting the sealing of a container, comprising: an irradiation unit for irradiating light along an optical path extending in a first direction; a sensor unit for detecting the light traveling along the optical path; and a pressing module for pressing the sealing of the container, wherein the pressing module includes a plurality of pressing units arranged on the optical path, and the pressing unit can be selectively located at a first position for blocking the light from reaching the sensor unit and a second position for allowing the light to reach the sensor unit.