PROBLEM TO BE SOLVED: To provide a substrate for a piezoelectric oscillator that can achieve reduction in size or thickness at a low cost.SOLUTION: A substrate 5 for an oscillator 1 is a substrate on which a vibration element 7 and an integrated circuit element 9 including an oscillation circuit are mounted on a first main surface 13a side by side. The substrate 5 is a single-layer substrate, and includes: a predetermined number of external terminals provided on a second main surface 13b, the predetermined number being two or more; a pair of vibration-element-pads 19 that are provided on the first main surface 13a and on which the vibration element 7 is to be mounted; a predetermined number of first integrated-circuit-element-pads 21 and a pair of second integrated-circuit-element-pads 23 that are provided on the first main surface 13a and are connected with the integrated circuit element 9; a predetermined number of front-back connection conductors 17 that extend in a thickness direction of an insulating substrate 13 from the predetermined number of external terminals and are exposed on the first main surface 13a; and a predetermined number of first interconnections 37, a pair of second interconnections 39, and a pair of cutting patterns 41 that are provided on the first main surface 13a and connects the predetermined number of external terminals, the pair of vibration-element-pads 19, the predetermined number of first integrated-circuit-element-pads 21 and the pair of second integrated-circuit-element-pads 23, and the predetermined number of front-back connection conductors 17.
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