PROBLEM TO BE SOLVED: To improve detection accuracy when detecting the displacement of an object in a non-contact manner.SOLUTION: An object displacement detection device for detecting the displacement of an object to be detected based on a transmission wave transmitted to the object to be detected and a reflection wave of the transmission wave by the object to be detected includes: a displacement amount calculation section for calculating the displacement of the object to be detected based on the transmission wave and the reflection wave； and a displacement component information extraction section for acquiring the displacement of the object to be detected based on the relationship between the time when an inflection point of a displacement wave form acquired based on the displacement calculated by the displacement amount calculation section occurs, and the displacement cycle of the object to be detected.【課題】非接触で物体の変位を検知する際の検知精度を向上させること。【解決手段】検知の対象となる物体に送信した送信波と該送信波の該検知の対象となる物体による反射波に基づいて、該検知の対象となる物体の変位を検知する物体変位検知装置は、送信波と反射波とに基づいて、検知の対象となる物体の変位を演算する変位量演算部と、該変位量演算部により演算される変位に基づいて取得される変位波形の変曲点の発生する時間と検知の対象となる物体の変位の周期との間の関係に基づいて、該検知の対象となる物体の変位を取得する変位成分情報抽出部とを備える。【選択図】図２
