There is provided a pretensioner 8. The pretensioner includes: a pipe 10; a gas generator 14 that generates a gas in the pipe 10 in an emergency case; a gas generator mount 13 on which the gas generator 14 is mounted; a spool driving mechanism that rotates a spool in a direction to retract a seatbelt 4 by the gas generated by the gas generator 14 in the emergency case; a discharge hole 13b formed in the pipe 10 so as to allow communication between inside and outside of the pipe 10; and a blocking member 25 configured to block the discharge hole 13b from inside of the pipe 10, the blocking member 25 being configured to open the discharge hole 13b when the blocking member 25 is pressed from outside of the pipe 10 with a pressing force equal to or greater than a given pressing force.
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