Abstract: In a surface mounting crystal unit comprising a quartz plate, a receptacle-like terminal member holding the quartz plate therein in such a way as to enable it to oscillate, and a lid covering an opening of the terminal member, the quartz plate is prepared in the shape of a rectangular parallelepiped and disposed such that one or both of shorter sides of the quartz plate at its both ends can be fixedly attached to flat surface portions of the terminal member with an electrically conductive adhesive of high plasticity so that the impact of a drop is buffered by the adhesive. A likelihood of any leakage is minimized by airtight bonding of the lid to the opening of the terminal member with an inorganic material such as a solder, and the like. Furthermore, crystal impedance is lowered by producing a vacuum inside the terminal member airtightly bonded by the lid.