The present invention relates to an oxidizing agent supply unit for a rocket device and to a breakage member for the same. The oxidizing agent supply unit can be controlled by only controlling an igniting unit and is for controlling the conveyance of an oxidizing agent between an oxidizing capsule and a solid fuel accordingly. The oxidizing agent supply unit for a rocket device, which is for connecting the solid fuel and the oxidizing agent capsule storing an oxidizing agent, includes: a supply which has an exposing hole forming an exhaust path for the oxidizing agent and is arranged between the solid fuel and the oxidizing agent capsule; a breakage member which prevents the solid fuel from being transmitted to the solid fuel and closes the exposing hole to enable decomposition of the oxidizing agent by using flames and heat; and a piercing member which has a through connection hole formed to correspond to the exposing hole while forming a discharging path for the oxidizing agent and is stacked on the breakage member to face the oxidizing agent capsule.
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