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| Name | Date of launch | Major objectives | Remarks |
| YURI (BS) | April 1978 | Experimental satellite for direct broadcasting satellite systems | Japan's first broadcasting satellite |
| YURI-2a (BS-2a) | January 1984 | Experimental satellite for direct broadcasting satellite systems (Elimination of blind spots and development of future technologies) | |
| YURI-2b (BS-2b) | February 1986 | ||
| YURI-3a (BS-3a) | August 1990 | Experimental satellite for direct broadcasting satellite systems (Continuation of BS-2 broadcast services and development of advanced technologies) | |
| YURI-3b (BS-3b) | August 1991 |
| Name | Date of launch | Major objectives | Remarks |
| KAKEHASHI (COMETS) | February 1998 | Communications engineering satellite that performed the maximum range of communications and functional confirmation tests on a sub-recurrent orbit |
| Name | Date of launch | Major objectives | Remarks |
| KIRARI (OICETS) | August 2005 | Engineering test satellite for experiments in optical communications between satellites using a laser beam | A bi-directional optical communication experiment with a data relay engineering satellite was successful, in the world's first optical communication experiment between a lower orbited satellite and an optical ground station. |
