To acquire measurement data collected on a desired cycle without collecting them anew.

This data recorder is equipped with: a control part 3 for collecting measurement data Dx to Dz with a prescribed cycle; and a storage part 4 for storing therein the plurality of groups of measurement data Dx to Dz collected by the control part 3. When a cycle of N-times (N is an integer ≥2) a prescribed cycle is specified in extracting prescribed data from the measurement data Dx to Dz stored in the storage part 4, the control part 3 extracts measurement data Dx to Dz collected with the cycle.