A surface-mount quartz crystal oscillator has a casing substantially in the shape of a substantially rectangular parallelepiped, the casing having a recess defined therein, a pair of upper steps disposed in the recess, a lower step disposed in the recess and having electrically conductive pads thereon, a crystal blank having an end secured to one of the upper steps and an opposite end placed on the other of the upper steps, and an IC chip disposed on the bottom of the recess and electrically connected to the electrically conductive pads by wires according to wire bonding, the IC chip including a circuit, the circuit and the crystal blank jointly making up an oscillating circuit. The wires extend in a direction substantially perpendicular to a longitudinal direction of the casing.