  We discuss a scenario that gravitinos produced non-thermally by an inflaton
decay constitute dark matter in the present universe. We find that this
scenario is realized for wide ranges of the inflaton mass and the vacuum
expectation value. What is intriguing about this scenario is that the gravitino
dark matter can have a relatively large free streaming length at
matter-radiation equality, which can be probed by future observation on
QSO-galaxy strong lens system.
