The present invention provides a bacteria-targeting capsid particle that is non-proliferating and that has a high bactericidal effect. A capsid protein of a phage is prepared with a capsid nucleic acid element that is separated from a phage genome, that does not include a packaging region, that mainly includes a virion region, and that synthesizes a capsid. An element for a bacteria-targeting capsid particle (B-CAP) includes a nucleic acid injection region, a replication region necessary for nucleic acid replication, and a packaging region which are separated from a portion of a phage genome other than a capsid nucleic acid element. A bacteria-targeting capsid particle (B-CAP) in which these are assembled is non-proliferating and enables inclusion of long-chain DNA which gives a new biological function including a bactericidal effect.

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