S2Looking is a building change detection dataset containing large-scale side-looking satellite images captured at different off-nadir angles. The dataset consists of 5,000 registered bi-temporal image pairs (size 1024*1024, 0.5 ~ 0.8 m/pixel) of rural areas around the world and more than 65,920 annotated change instances. The dataset provides two label maps indicating the newly built and demolished building areas for each sample in the dataset.