To reduce the occurrence of an excessive encoding amount or an insufficient encoding amount and reduce the fluctuation range of the bit rate even when there is a change in the area of a region-of-interest or the properties of an image. An image encoding device according to an embodiment of the present invention includes: a block-of-interest determining unit configured to determine whether or not a block is a block-of-interest including a pixel-of-interest; a region-of-interest area-ratio calculator configured to calculate a region-of-interest area ratio based on a determination result obtained by the block-of-interest determining unit; a rate controller configured to decide a region-of-interest quantization parameter and a non-region-of-interest quantization parameter based on at least a bit rate of compression data and the region-of-interest area ratio; and a compressor configured to compress an image input in accordance with a predetermined encoding method by using the block-of-interest, the region-of-interest quantization parameter, and the non-region-of-interest quantization parameter.