An electric rice pressure cooker, the pressure cooker comprising: a main body case which has an open top; an inner pot which is provided inside the main body case; and a cover which is hinge-coupled to the main body case and disposed to cover the open top of the main body case, wherein the inner pot comprises: a plurality of flange portions provided on a top portion of the inner pot at predetermined intervals along a circumferential direction of the inner pot; and a sloped surface formed on the top end of the inner pot, and the cover comprises: a sealing member which has a circular hole in the center thereof and is seated on the inner pot, and has a bottom surface which is seated on and contacts the inner pot, and is formed to correspond to the top end of the inner pot; and an inner cover which has a receiving space therein in which the sealing member moves vertically and the inner surface of the receiving space is configured to maintain a tight seal with the peripheral end portion of the sealing member, and the sloped surface of the inner pot is tapered, and the sealing member has a bent portion so as to contact the sloped surface of the inner pot and the inner surface of the inner cover, and a part of the bent portion contacting the sloped surface is formed as a sealing surface which corresponds in shape to the sloped surface, characterized in that the cooker is configured so that steam generated during cooking in the inner pot passes through the circular hole into the receiving space and presses the sealing member downwards, the sealing surface being in contact with the sloped surface, wherein the sectional area of a top surface of the sealing member in the receiving space and to be contacted by the steam is greater than the sectional area of the bottom surface of the sealing member to be contacted by the steam, so that the pressure force exerted on the top surface of the sealing member by the steam is greater than the pressure force exerted by the steam on the bottom surface of the sealing member. a main body case which has an open top; an inner pot which is provided inside the main body case; and a cover which is hinge-coupled to the main body case and disposed to cover the open top of the main body case, wherein the inner pot comprises: a plurality of flange portions provided on a top portion of the inner pot at predetermined intervals along a circumferential direction of the inner pot; and a sloped surface formed on the top end of the inner pot, and a plurality of flange portions provided on a top portion of the inner pot at predetermined intervals along a circumferential direction of the inner pot; and a sloped surface formed on the top end of the inner pot, and the cover comprises: a sealing member which has a circular hole in the center thereof and is seated on the inner pot, and has a bottom surface which is seated on and contacts the inner pot, and is formed to correspond to the top end of the inner pot; and an inner cover which has a receiving space therein in which the sealing member moves vertically and the inner surface of the receiving space is configured to maintain a tight seal with the peripheral end portion of the sealing member, and a sealing member which has a circular hole in the center thereof and is seated on the inner pot, and has a bottom surface which is seated on and contacts the inner pot, and is formed to correspond to the top end of the inner pot; and an inner cover which has a receiving space therein in which the sealing member moves vertically and the inner surface of the receiving space is configured to maintain a tight seal with the peripheral end portion of the sealing member, and the sloped surface of the inner pot is tapered, and the sealing member has a bent portion so as to contact the sloped surface of the inner pot and the inner surface of the inner cover, and a part of the bent portion contacting the sloped surface is formed as a sealing surface which corresponds in shape to the sloped surface, characterized in that the cooker is configured so that steam generated during cooking in the inner pot passes through the circular hole into the receiving space and presses the sealing member downwards, the sealing surface being in contact with the sloped surface, wherein the sectional area of a top surface of the sealing member in the receiving space and to be contacted by the steam is greater than the sectional area of the bottom surface of the sealing member to be contacted by the steam, so that the pressure force exerted on the top surface of the sealing member by the steam is greater than the pressure force exerted by the steam on the bottom surface of the sealing member.