A lot of research has already accumulated on the 1912-13 political crisis and Katsura Taro's new political party. On the other hand, there is no much research into the movement in the House of Peers. This article aims to make clear movement in the House of Peers, the political process in the House, and also understand the meaning of the Katsura's new political party in parliamentary government history. Part 1 clarifies the political transition from Katsura Taro's resignation in 1911 to the day his formed his new party. As to why he formed his new party, first discord with Yamagata Aritomo began to make it possible for him to lose his own political base altogether. Secondly, the new political party aimed at the establishment of a huge power base across both Houses of the Diet. Part 2 clarifies the relationship between the Katsura's new political party and the House of Peers, by likening it to the change occuring in the two influential groups in the House : the Saiwai Club and the Kenkyukai. An intimate relationship between the new political party and those groups had been maintained throughout Katsura's second cabinet, but it grew worse gradually afterwards. When the Katsura's third cabinet was organized, Oura Kanetake, a leading member at the Saiwai Club and as a Cabinet minister, and his comrades made a request to members of those groups to participate in Katsura's new party. However, Hirata Tosuke, a leading member opposed such a move tendency towards. Finally, nonparticipation became dominate among them over a strong participation at first. In the Kenkyukai, Hirata's request also ended in failure because of counterinfluence mainly formed among younger members. The House of Peers did not participate in the new political party, which shows the permeation of personal views of "hree and unbiased policy" in that aristocratic chamber. However, it seems that the later changes in the House of Peers were caused by the gradual progress of the above movements, like political disagreement between executives of the Saiwai Club and growing power of young members of the Kenkyunkai.
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