The invention is to ensure the opportunity for the abnormality diagnosis in a wide operating region, and an object thereof is to provide an abnormality diagnosis device of the in-cylinder pressure sensor capable of detecting accurately the cylinder pressure at high S / N ratio. An abnormality diagnosis device of the cylinder pressure sensor (16) for outputting a value corresponding to the cylinder internal pressure of an internal combustion engine, the ignition timing is retarded so ignition timing is after the compression top dead center, ignition and before ignition to produce a peak of each cylinder pressure after (S100). If you retarding the ignition timing, the output value of the cylinder pressure sensor at the peak of the in-cylinder pressure before the ignition (hereinafter, referred to as pre-ignition output peak values.) And detecting at least one of the crank angle (S110). Determining an abnormality of the cylinder pressure sensor (16) using at least one of the ignition prior to the output peak value and the crank angle (S140).
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