A soundproof structure, comprising: one or more soundproof cells, wherein each of the one or more soundproof cells comprises a frame having a through-hole, a film fixed to the frame, and an opening portion configured to include one or more holes drilled in the film, neither end portions of the through-hole of the frame are closed, and the soundproof structure has a shielding peak frequency, which is determined by the opening portion of each of the one or more soundproof cells and at which a transmission loss is maximized, on a lower frequency side than a first natural vibration frequency of the film of each of the one or more soundproof cells, and selectively insulates sound in a predetermined frequency band including the shielding peak frequency at its center, the first natural vibration frequency is determined by a shape and a size of the frame of each of the one or more soundproof cells and thickness and flexibility of the film of each of the one or more soundproof cells, the shielding peak frequency is determined according to an average area ratio of the opening portions of the one or more soundproof cells, and wherein, assuming that a circle equivalent radius of the frame is R1 mm, a thickness of the film is t1 μm, a Young' s modulus of the film is E1 GPa, and a circle equivalent radius of the opening portion is r μm, a parameter A expressed by following Equation is 0.07000 or more and 759.1 or less, A = √ E 1 * t 1 1.2 * ln r − e / R 1 2.8 where e is a Napier's constant, and ln(x) is a logarithm of x with base e, wherein, assuming that a circle equivalent radius of the frame is R2 m, a thickness of the film is t2 m, a Young' s modulus of the film is E2 Pa, and a density of the film is d kg/m3, a parameter B expressed by following Equation is 15.47 or more and 23500 or less, B = t 2 / R 2 2 * √ E 2 / d wherein, assuming that a shielding frequency with respect to the parameter A is F s, and a first natural vibration frequency with respect to the parameter B is E nv, a relation between the parameter A and the parameter B satisfies following Equation, F s A < E nv B, and characterised in that the area ratio of said one or more holes and said frame is less than 1.4%. one or more soundproof cells, wherein each of the one or more soundproof cells comprises a frame having a through-hole, a film fixed to the frame, and an opening portion configured to include one or more holes drilled in the film, neither end portions of the through-hole of the frame are closed, and the soundproof structure has a shielding peak frequency, which is determined by the opening portion of each of the one or more soundproof cells and at which a transmission loss is maximized, on a lower frequency side than a first natural vibration frequency of the film of each of the one or more soundproof cells, and selectively insulates sound in a predetermined frequency band including the shielding peak frequency at its center, the first natural vibration frequency is determined by a shape and a size of the frame of each of the one or more soundproof cells and thickness and flexibility of the film of each of the one or more soundproof cells, the shielding peak frequency is determined according to an average area ratio of the opening portions of the one or more soundproof cells, and wherein, assuming that a circle equivalent radius of the frame is R1 mm, a thickness of the film is t1 μm, a Young' s modulus of the film is E1 GPa, and a circle equivalent radius of the opening portion is r μm, a parameter A expressed by following Equation is 0.07000 or more and 759.1 or less, A = √ E 1 * t 1 1.2 * ln r − e / R 1 2.8 where e is a Napier's constant, and ln(x) is a logarithm of x with base e, wherein, assuming that a circle equivalent radius of the frame is R2 m, a thickness of the film is t2 m, a Young' s modulus of the film is E2 Pa, and a density of the film is d kg/m3, a parameter B expressed by following Equation is 15.47 or more and 23500 or less, B = t 2 / R 2 2 * √ E 2 / d wherein, assuming that a shielding frequency with respect to the parameter A is F s, and a first natural vibration frequency with respect to the parameter B is E nv, a relation between the parameter A and the parameter B satisfies following Equation, F s A < E nv B, and characterised in that the area ratio of said one or more holes and said frame is less than 1.4%.