There is provided a library apparatus that including a storage rack configured to store a plurality of storage media, a recording-reproducing device configured to perform writing of data to the storage media and reading of data from the storage media, a first movement device configured to include, a first attachment-detachment mechanism that inserts a storage medium to and extracts the storage medium from the storage rack or the recording-reproducing device, a first driving unit that supplies first driving force to the first attachment-detachment mechanism, and a first coupling unit that transmits second driving force to the first attachment-detachment mechanism, and a second movement device configured to include, a second coupling unit that transmits third driving force to the first coupling unit when the second coupling unit is coupled with the first coupling unit, and a second driving unit that supplies fourth driving force to the second coupling unit.