A child-resistant lighter includes a main body, a wheel racket, a file wheel, a
metal cap, and a lever is disclosed. The lever having an upward
slant angle of α is within the range 10°≦α≦20° further includes a pressing part, a base, and a slipping hole. Both sides of the base furnish a salient part for acting as the pivot point of the lever, and the salient part is fitted into a securing hole provided at the bottom portion of the file wheel. The securing holes are used as the pivotal bearing seat for bearing the salient part. The pressing part having a slant surface forms an angle θ with respect to the lever and has a horizontal downward
slant angle(θ-α). When it comes to use, the user exerts a force P by pressing on the slant surface of the pressing part and the file wheel with his / her
thumb making the lighter generate flames. The
effective force acting on the lever is P cos θ where the effective range of θ is 27°≦θ≦60°, thereby the range of the
effective force is 0.5P≦P cos θ≦0.9P. Therefore, the child-resistant lighter of the invention is capable of preventing the children from
carelessness or accidental igniting, thereby improving the safety
efficacy of the child-resistant lighter. As a result, the lighter of the invention is capable of protecting the children from causing
fire accident to achieve the
efficacy of safety usage of the lighter. In this way, the lighter of the invention is capable of improving the
efficacy of safety usage. Nevertheless, the exerting force P is still within the range of an adult user.