Abstract:Teacher competence is one aspects that affecting the educational quality in many country over the world. Teacher competence was affected by some factors. These factors including teacher creativity, teacher interest, teacher attitude, teacher motivation to work, and motivation to achieve, principal leadership, school culture, compensation, job satisfaction, and school facilities. Science physics teacher competence also affected by these factors. In junior high school in West Seram Regency, the competence of science physics teacher was not well documented. This research aim was to determine the most important factors that affect the science physics teacher competence in junior high school in West Seram Regency. Research variables that were measured consist of science physics teacher creativity (X 1 ), science physics teacher motivation to work (X 2 ), science physics teacher interest (X 3 ), science physics teacher attitude (X 4 ), science physics motivation to achieve (X 5 ), compensation (X 6 ), job satisfaction (X 7 ) school culture (X 8 ), Principal leadership (X 9 ), and facilities in the school (X 10 ). The obtained data then analyzed by using the principle component analysis to reveal the most variable that affecting science physics teacher competence in the junior high school in South West Seram Regency. that from 10 factors that affect the competence of teachers, there are seven factors that most affect the competence of science physics teachers at junior high school in West Seram Maluku Regency. These factors identified as an internal factors (interests, attitudes, and creativity of teachers ), and external factors, namely the principal's leadership, compensation, school culture, and school facilities.