In April 1927 the master Jigoro Kano created an institute within the Kodokan to preserve the traditional martial arts of Japan. He set up a room for the study and research of Koryu Bujutsu and invited different masters of these ancient arts to put them at the service of Judo. Jigoro Kano fought tirelessly for Naginata, Bo, Yari, Katana and Aikijujutsu to be integrated into the usual practice of Judo Kodokan. Advantageous students of Jigoro Kano learned together with the best representatives of Katori Shinyo Ryu, Daito ryu Aikijujutsu, Shinto Muso ryu, etc. Several times a month they met with Kano to show him their progress. After the Meiji restoration, Japanese society largely rejected traditional military arts, this situation worsened in the Taisho period with the increase in trade with the West and the assimilation of its customs. Given the rapid expansion of Judo as heir to Jujutsu, Kano realized the need to maintain and preserve other koryu as well. In this work we carry out the study of the creation of the Kobudo Kenkyukai and the most relevant members who belonged to this special section of the Kodokan, contributing ancient documents of Jigoro Kano. We also summarize the techniques of Kenjutsu, Bojutsu, Naginatajutsu, Sojutsu and Aikijujutsu that were practiced at the Kobudo Kenkyukai. We continue working so that the traditional judo and the legacy of Jigoro Kano become part of the current Judo.