A drawer type breaker comprising: a drawer frame; a terminal device including a plurality of drawer-frame side conductors (22, 23) connectable to a supply-side conductor and a load-side conductor, the terminal device being configured to be secured in the drawer frame; a circuit breaker body including a plurality of breaker-side conductors (11, 12) configured to be connected to the plurality of drawer-frame side conductors (22, 23) in a state in which the conductors (22, 23) are received in the drawer frame, the breaker body being configured to be drawable out of the drawer frame; and a shutter mechanism including a panel unit having a plurality of openings (512a, 512b) configured to be penetrated by the plurality of breaker-side conductors (11, 12) when the breaker body is received in the drawer frame, the panel unit being disposed between the terminal device and the breaker body, and a shutter unit configured to shut the plurality of openings (512a, 512b) when the breaker body is drawn out of the drawer frame, wherein the terminal device includes an insulation base having a plurality of terminal receiving portions (211, 212) configured to receive the plurality of drawer-frame side conductors (22, 23), and having an airway portion including one or more airways (2151, 2152, 2153, 2154) connected to at least one of the terminal receiving portions (211, 212), wherein the airway portion includes an airway between the terminal receiving portions (211, 212), wherein the drawer type breaker comprises a slider (53, 54) placed in the insulation base, which is configured to move the shutter unit in a direction for drawing out the breaker body in accordance with drawing out the breaker body from the drawer frame, wherein the insulation base includes a slider housing portion (213, 214) formed between the terminal receiving portions (211, 212), which is configured to house the slider (53, 54) movably in a direction in which the slider is opposed to the breaker body, characterized in that the slider (53, 54) includes one or more openings forming an airway between the terminal receiving portions (211, 212). a drawer frame; a terminal device including a plurality of drawer-frame side conductors (22, 23) connectable to a supply-side conductor and a load-side conductor, the terminal device being configured to be secured in the drawer frame; a circuit breaker body including a plurality of breaker-side conductors (11, 12) configured to be connected to the plurality of drawer-frame side conductors (22, 23) in a state in which the conductors (22, 23) are received in the drawer frame, the breaker body being configured to be drawable out of the drawer frame; and a shutter mechanism including a panel unit having a plurality of openings (512a, 512b) configured to be penetrated by the plurality of breaker-side conductors (11, 12) when the breaker body is received in the drawer frame, the panel unit being disposed between the terminal device and the breaker body, and a shutter unit configured to shut the plurality of openings (512a, 512b) when the breaker body is drawn out of the drawer frame, wherein the terminal device includes an insulation base having a plurality of terminal receiving portions (211, 212) configured to receive the plurality of drawer-frame side conductors (22, 23), and having an airway portion including one or more airways (2151, 2152, 2153, 2154) connected to at least one of the terminal receiving portions (211, 212), wherein the airway portion includes an airway between the terminal receiving portions (211, 212), wherein the drawer type breaker comprises a slider (53, 54) placed in the insulation base, which is configured to move the shutter unit in a direction for drawing out the breaker body in accordance with drawing out the breaker body from the drawer frame, wherein the insulation base includes a slider housing portion (213, 214) formed between the terminal receiving portions (211, 212), which is configured to house the slider (53, 54) movably in a direction in which the slider is opposed to the breaker body, characterized in that the slider (53, 54) includes one or more openings forming an airway between the terminal receiving portions (211, 212).