An in-vivo camera device and an in-vivo monitoring camera system more excellent in usability are proposed. An in-vivo camera device includes a camera unit introduced into a body, a support member, and a camera-side cable. The support member has a trocar connection portion for connection with a trocar at a front end side, and is connected to the trocar in a state in which the trocar connection portion is fitted into the trocar by applying tensile force to the camera-side cable passing through the trocar. The support member is provided with a guide introduction portion that is formed to be relatively long at the front end side as a stabilization structure for stabilizing connection with the trocar.