A strain estimation device that estimates strain of a component provided in a fluid and inside a pipe, the strain estimation device comprising: an operating-point-information acquisition unit configured to acquire operating-point information about the component; a pressure acquisition unit configured to acquire a pressure signal including time-series pressure values at a predetermined position in a vicinity of the component, wherein the pressure signal is measured with a first sensor provided at an inner surface of the pipe and provided in the vicinity of the component; an offset removal unit configured to remove offset from the pressure signal; an estimation unit configured to estimate, based on the pressure signal in which the offset has been removed, a strain signal including time-series strain values occurring at the component; an offset recovery unit configured to recover offset of the strain signal; and an output unit configured to output the strain signal in which the offset has been recovered, wherein the operating-point-information acquisition unit is configured to acquire, as the operating-point information, pressure and temperature measured by a second sensor that is disposed at an upstream position of the fluid and with which the pipe is provided, flow rate of the fluid, and rotational speed of the component, the estimation unit is configured to convert the pressure signal in which the offset has been removed into the strain signal using an estimation filter determined based on a power spectral density of pressure and a power spectral density of strain occurring at the component when the pressure is applied to the position, and the offset recovery unit is configured to calculate the offset of strain based on the operating-point information and recover the offset of the strain signal by adding the offset to each strain value of the strain signal. an operating-point-information acquisition unit configured to acquire operating-point information about the component; a pressure acquisition unit configured to acquire a pressure signal including time-series pressure values at a predetermined position in a vicinity of the component, wherein the pressure signal is measured with a first sensor provided at an inner surface of the pipe and provided in the vicinity of the component; an offset removal unit configured to remove offset from the pressure signal; an estimation unit configured to estimate, based on the pressure signal in which the offset has been removed, a strain signal including time-series strain values occurring at the component; an offset recovery unit configured to recover offset of the strain signal; and an output unit configured to output the strain signal in which the offset has been recovered, wherein the operating-point-information acquisition unit is configured to acquire, as the operating-point information, pressure and temperature measured by a second sensor that is disposed at an upstream position of the fluid and with which the pipe is provided, flow rate of the fluid, and rotational speed of the component, the estimation unit is configured to convert the pressure signal in which the offset has been removed into the strain signal using an estimation filter determined based on a power spectral density of pressure and a power spectral density of strain occurring at the component when the pressure is applied to the position, and the offset recovery unit is configured to calculate the offset of strain based on the operating-point information and recover the offset of the strain signal by adding the offset to each strain value of the strain signal.