noun
acting prime minister
Refers to a person temporarily performing the duties of the prime minister, typically during absence or incapacity.
首相が海外出張中は、副総理が首相臨時代行を務める。
While the prime minister is on an overseas trip, the deputy prime minister serves as acting prime minister.
Compound of 首相 (prime minister), 臨時 (temporary), and 代行 (acting on behalf).