These are test session movie data in experiment 1 and rawdata of "Dataset of reaching behavior for reward in social situations in mice." Abstract This article contains data on reaching behavior for reward in social situations in mice. The mice first learn to acquire food by reaching their limb in the reaching room. The mice that have learnt reaching are placed in an observation room where they can observe the reaching activity of another mouse in the reaching room. The aim of this study was to see if observing other mice depended on whether the mice learn reaching behavior or not. The data included all animals’ properties and conditions, the pairing state of another mouse (cage mate or non-cage mate), and a set of behavioral analyses. Our data provides yet another level of information to help gain a more comprehensive understanding of interactive social behavior in mice and it also helps other researchers to conduct this behavioral test to research mirror neuron system in mice.