OUTPUT COMPENSATOR FOR IN-CYLINDER PRESSURE SENSOR, AND IN-CYLINDER PRESSURE DETECTOR EQUIPPED WITH THE SAME

An object is to provide an output correction apparatus which can correct offset drift of a cylinder internal pressure sensor, and a cylinder internal pressure detection apparatus which can accurately detect cylinder internal pressure of an internal combustion engine through use of the output correction apparatus. A cylinder internal pressure detection apparatus 12 includes a detection circuit section 200 which detects a change in the resistance of a piezoresistor element 138 as an electrical signal; an amplification circuit section 201 which amplifies and outputs the electrical signal (output value); and a correction circuit section 202 which corrects the output value. The correction circuit section 202 is composed of a reset control section 205 which resets the output value of the amplification circuit section 201 to a reference value, and a reset timing detection section 206 which determines a timing of the resetting. The reset timing detection section 206 measures the waveform period of an output waveform output from the amplification circuit section 201, calculates the reset timing on the basis of the waveform period, and outputs a reset signal to the reset control section 205 at the reset timing.