To provide a data retrieval system for reducing load of retrieval processing.

A data retrieval system 1 includes: an index storage part 22 storing an index of data to which a user is authorized to refer in association with user specification information uniquely specifying the user; an input processing part 10 for inputting the user specification information and retrieval conditions input by the user; an authentication verification part 14 for specifying the index corresponding to the user specification information output from the input processing part 10 from the index stored in the index storage part 22; and an index retrieval part 16 for retrieving data satisfying the retrieval conditions by using the index specified by the authentication verification part 14.