The purpose of this study is to recommend on the public library service for older adults through the analysis of the perceptions of older adults and librarians. To achieve the study purpose, interview method was employed. The interview questions are composed based on the ALA guidelines. According to the study results, the following ten factors were recommended by older adults: 1) various customized life long learning programs for older adults, 2) highly qualified staff for the public library life long learning programs and regular evaluation for the staff, 3) provision of various and new information resources, 4) promotion of public library services and programs, 5) public library staff’s kindness and professionalism, 6) regular reeducation of the public library staff, 7) library user education, 8) customized resources, facilities, and equipments for older adults, 9) provision of the library space, and 10) customized library services for older adults. In addition, the following four factors were mentioned by librarians: 1) customized services and programs for older adults, 2) customized collection, facilities, and equipments, 3) adequate budget for public library service for older adults, 4) professionals for the public library service for older adults. The followings were recommended by both the older adults and librarians: 1) Customized library services, programs, collection, equipments, facilities for older adults, 2) Professionals for the public library service for older adults and Regular reeducation for them.