The needle thread cassette sewing machine with miniaturized cassette mounting portion (3) is provided. Are formed in a vertical groove-shaped cassette mounting portion including a balance moving area to the arm head of the sewing machine (3), the cassette mount (3), the needle thread cassette housed vertically thread spool is (62) ( 2) is removably mounted from vertically upward. In a state of stopping (25) balances at a position corresponding to the needle up stop position, by mounting the cassette mount (3) needle thread cassette (2), tension the thread retainer (25) balance threading is performed (9) vessel.
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