An abnormal tissue pattern detection apparatus capable of accurately detecting abnormal tissue pattern candidates by mutually compensating for the disadvantage of the processing using a morphology filter and the disadvantage of the processing using a Laplacian filter. When an image is inputted, a first candidate detection section detects first abnormal tissue pattern candidates by performing filtering using a morphology filter. At the same time, a second candidate detection section detects second abnormal tissue pattern candidates by performing filtering using a Laplacian filter. A determination section detects a second abnormal tissue pattern candidate, with which a first abnormal tissue pattern candidate overlaps, as a final abnormal tissue pattern candidate.
