PROBLEM TO BE SOLVED: To provide a piezoelectric device having appropriate strength, and a piezoelectric module and an electronic apparatus.SOLUTION: A piezoelectric device comprises: an element substrate 41 having a first surface (actuation surface 41B) and a second surface (back surface 41A) of an opposite side to the first surface, and having recessed opening portions provided on the first surface and supporting portions surrounding the recessed opening portions； piezoelectric materials (piezoelectric elements 413) provided on the second surface of the recessed opening portions； a plurality of connection electrodes (lower connection electrodes 414A and upper connection electrodes 416A) being connected to the piezoelectric materials and led out from the piezoelectric materials to the second surface of the supporting portions； reinforcing plates (sealing plates 42) bonded to a second surface side of the element substrate 41； and a plurality of through electrodes (first through electrodes 423 and second through electrodes 424) being provided at positions facing supporting portions of the reinforcing plates, passing through the reinforcing plates in a thickness direction and connected to individual ones of the plurality of connection electrodes.SELECTED DRAWING: Figure 5【課題】適切な強度を備える圧電デバイス、圧電モジュール及び電子機器を提供する。【解決手段】圧電デバイスは、第一面（作動面４１Ｂ）及び第一面とは反対側の第二面（背面４１Ａ）を有し、第一面に設けられた凹状開口部、及び凹状開口部を囲う支持部を有する素子基板４１と、凹状開口部の第二面に設けられた圧電体（圧電素子４１３）と、圧電体に接続され、圧電体から支持部の第二面に引き出された複数の接続電極（下部接続電極４１４Ａ及び上部接続電極４１６Ａ）と、素子基板４１の第二面側に接合される補強板（封止板４２）と、補強板の支持部に対向する位置に設けられ、補強板を厚み方向に貫通し、複数の接続電極のそれぞれに対して接続される複数の貫通電極（第一貫通電極４２３及び第二貫通電極４２４）と、を備える。【選択図】図５
