A piezo-electric oscillator has a reduced manufacturing cost using a
general purpose piezo-electric vibrator, while coping with
miniaturization. The piezo-electric oscillator has resin; a substrate
having an upper face, a bottom face, a conductive terminal portion, and a
mounting terminal portion at the bottom face; and a piezo-electric
vibrator including a package, a conductive portion, a cover plate, a
piezo-electric vibration piece, an external terminal portion; and an
oscillation circuit element having an oscillation circuit. The
piezo-electric vibration piece is housed within the package and, the
package is fixed to the upper face of the substrate and sealed with the
cover plate. The external terminal portion at a surface of the package is
electrically coupled with the piezo-electric vibration piece and, at
least the conductive portion excluding the mounting terminal portion is
sealed with the resin. The oscillation circuit element is fixed to a face
of the package opposite to the substrate. The conduction terminal portion
on the upper face of the substrate is electrically coupled with the
mounting terminal portion, and the external terminal portion and the
conduction terminal portion are electrically coupled with the oscillation
circuit element.