A charging roller includes a conductive shaft, an elastic body layer formed on an outer periphery of the conductive shaft, and a surface layer formed on an outer periphery of the elastic body layer. The surface layer contains a binder resin and conductive particles. The binder resin contains only a thermoplastic resin. The conductive particles contain first conductive particles and second conductive particles. The first conductive particles are carbon black particles. A particle size distribution of the conductive particles has at least one peak within a range of not less than 0.01 m but not more than 1 m. A water contact angle y of the thermoplastic resin and a ratio x of a surface area of the first conductive particles with respect to a surface area of the entire conductive particles satisfy the following expressions: 40y<180, y(800/13)x+(408/13), and y400x+3440.