In the present invention, provided is an organic piezoelectric material specifically exhibiting high orientation and thermal stability as an organic piezoelectric material exhibiting an excellent piezoelectric characteristic and having piezoelectricity and pyroelectricity, which is capable of converting thermal or mechanical simulation into electrical energy, and also provided are an ultrasound probe for which the organic piezoelectric material is used, and an ultrasound image detector thereof. It is a feature that an organic piezoelectric material of the present invention possesses a compound represented by Formula (1) and a base material made of an organic polymeric material, satisfying Expression (1): CLogP (1)−CLogP (base material)≦3.0 when CLogP values of the compound and the base material are expressed as CLogP (1) and CLogP (base material), respectively.
