A secondary battery comprising: an electrode assembly; a pouch in which the electrode assembly is accommodated and provided with a gas discharge part; a first adhesive material which is configured to seal the gas discharge part through adhesive force, wherein, when a pressure within the pouch increases above a set pressure, the adhesive force of the first adhesive material is broken to open the gas discharge part; and a self-restoring adhesive member configured to reseal the opened gas discharge part through the adhesive force, wherein the pouch comprises: a first case provided with a first accommodation surface configured to accommodate one end of the electrode assembly, a first unsealing surface provided on a portion of an edge of the first accommodation surface, and a first sealing surface provided on a remaining portion of the edge of the first accommodation surface; and a second case provided with a second accommodation surface configured to accommodate the other end of the electrode assembly, a second unsealing surface provided on a portion of an edge of the second accommodation surface, and a second sealing surface provided on a remaining portion of the edge of the second accommodation surface, wherein the gas discharge part is formed between the first unsealing surface and the second unsealing surface, which correspond to each other, the first adhesive material is provided between the first unsealing surface and the second unsealing surface, and the first unsealing surface and the second unsealing surface adhere to each other to seal the gas discharge part, wherein, when the pressure within the pouch increases above the set pressure, adhesive force between the first unsealing surface and the second unsealing surface is broken to open the gas discharge part, the self-restoring adhesive member is provided with a second adhesive material and a capsule in which the second adhesive material is embedded and adheres between the first unsealing surface and the second unsealing surface by the first adhesive material, and in the self-restoring adhesive member, when a gap between the first unsealing surface and the second unsealing surface is widened by the gas discharged to the gas discharge part, the capsule is split or broken to allow the second adhesive material to flow out so that the first unsealing surface and the second unsealing surface adhere again to each other by the second adhesive material that flows out, wherein the self-restoring adhesive member is provided in plurality, and the plurality of self-restoring adhesive members are provided to be dispersed throughout the first adhesive material,and wherein the pouch is provided with an elastic member configured to provide elastic force so that the first unsealing surface and the second unsealing surface are maintained in a close contact with each other. an electrode assembly; a pouch in which the electrode assembly is accommodated and provided with a gas discharge part; a first adhesive material which is configured to seal the gas discharge part through adhesive force, wherein, when a pressure within the pouch increases above a set pressure, the adhesive force of the first adhesive material is broken to open the gas discharge part; and a self-restoring adhesive member configured to reseal the opened gas discharge part through the adhesive force, a first case provided with a first accommodation surface configured to accommodate one end of the electrode assembly, a first unsealing surface provided on a portion of an edge of the first accommodation surface, and a first sealing surface provided on a remaining portion of the edge of the first accommodation surface; and a second case provided with a second accommodation surface configured to accommodate the other end of the electrode assembly, a second unsealing surface provided on a portion of an edge of the second accommodation surface, and a second sealing surface provided on a remaining portion of the edge of the second accommodation surface, wherein the gas discharge part is formed between the first unsealing surface and the second unsealing surface, which correspond to each other, the first adhesive material is provided between the first unsealing surface and the second unsealing surface, and the first unsealing surface and the second unsealing surface adhere to each other to seal the gas discharge part, wherein, when the pressure within the pouch increases above the set pressure, adhesive force between the first unsealing surface and the second unsealing surface is broken to open the gas discharge part, the self-restoring adhesive member is provided with a second adhesive material and a capsule in which the second adhesive material is embedded and adheres between the first unsealing surface and the second unsealing surface by the first adhesive material, and in the self-restoring adhesive member, when a gap between the first unsealing surface and the second unsealing surface is widened by the gas discharged to the gas discharge part, the capsule is split or broken to allow the second adhesive material to flow out so that the first unsealing surface and the second unsealing surface adhere again to each other by the second adhesive material that flows out, wherein the self-restoring adhesive member is provided in plurality, and the plurality of self-restoring adhesive members are provided to be dispersed throughout the first adhesive material,and wherein the pouch is provided with an elastic member configured to provide elastic force so that the first unsealing surface and the second unsealing surface are maintained in a close contact with each other.