This study investigated how the several factors of BGM (Background music) affected the time estimation . We composed 28 original music tunes with different tempo and notes. Twenty undergraduates estimated one minute by the use of the method of production while listening to a BGM. Results showed that participants underestimated the duration while listening to a tune with a slow tempo, whereas they overestimated while listening to the tunes with fast tempo. The participants overestimated the duration with the increment of the number of the notes per unit time and variety of a note. In addition, the music experiences influenced the auditory time estimation.