An image decoding apparatus includes an information acquisition section that acquires information of a bit-plane truncation position in an encoded stream from the encoded stream generated by performing bit-plane encoding on a transform coefficient, a decoding process section that performs a decoding process on the encoded stream and generates a transform coefficient, and a significant coefficient detection section that detects whether the transform coefficient generated in the decoding process section is significant. The image decoding apparatus includes a correction value acquisition section that acquires a correction value corresponding to the bit-plane truncation position in the transform coefficient detected to be significant, from a correction value table, and a coefficient correction processing section that performs coefficient correction processing on the transform coefficient using the correction value acquired in the correction value acquisition section only for the transform coefficient detected to be significant in the significant coefficient detection section.