In a crystal unit, a crystal blank is accommodated in a container body composed of a bottom wall layer and a frame wall layer, and a metal cover is bonded to the container body by a eutectic alloy. The crystal blank is held by a pair of crystal connecting terminals formed at a position to be an inner bottom surface of a container body on one end portion side of the container body. A grounding external terminal is arranged at one corner of the outer bottom surface of the container body at the other end portion side of the container body. To connect the metal cover to the grounding external terminal, a first conduction metal film electrically connected to the metal cover through an end face metal film on an inner side surface of the frame wall layer is formed on a lower surface of the frame wall layer, and a second conduction metal film electrically connected to the grounding external terminal through an end face metal film on a container body outer side surface is formed on an upper surface of the bottom wall layer, corresponding to the positions where the grounding external terminals are formed.