Composite particles comprising: a hydrophobic solid particle A; and a hydrophobic solid particle B over a surface of the hydrophobic solid particle A, wherein a contact angle CAa of the hydrophobic solid particle A with water is 110 degrees or greater but 180 degrees or less, wherein a contact angle CAb of the hydrophobic solid particle B with water is 110 degrees or greater but 180 degrees or less, wherein a ratio (d50a/d50b) of a number average particle diameter d50a of the hydrophobic solid particle A to a number average particle diameter d50b of the hydrophobic solid particle B is 10 or greater but 100 or less, and wherein a coating ratio CR of the composite particles expressed by Formula 1 below is 50% or higher but 500% or lower, Coating ratio CR % = π d 50 b / 2 2 4 π d 50 a / 2 + d 50 b / 2 2 × X b g / Y b g / μm 3 / Z b μm 3 X a g / Y a g / μm 3 / Z a μm 3 × 100 where in Formula 1, Xa represents a mass (g) of the hydrophobic solid particle A, Xb represents a mass (g) of the hydrophobic solid particle B, Ya represents a density (g/cubic micrometer) of the hydrophobic solid particle A, Yb represents a density (g/cubic micrometer) of the hydrophobic solid particle B, Za represents a volume (cubic micrometer) of the hydrophobic solid particle A, and Zb represents a volume (cubic micrometer) of the hydrophobic solid particle B, wherein contact angle CAa and CAb are measured as follows: a plate-shaped body obtained by hot-pressing the material constituting the solid particles A or B or a plate-shaped body obtained by casting a dispersion liquid of the material constituting the solid particles A or B over a substrate is used as the sample to be measured, and the angle formed between the liquid surface of water and the surface of the plate-shaped body when the water is located in an amount of 10 microliters over the sample with a microsyringe is measured as the contact angle CAa or CAb with the water; number average particle diameter d50a and d50b are measured as follows: an image of each of the solid particles A and B isolated is taken with a scanning electron microscope, and the average of longest diameters of ten particles arbitrarily selected from the taken electron microscopic image is calculated as the number average particle diameter of each; mass Xa and Xb are as measured with a precision balance; density Ya and Yb are as measured with a Gay-Lussac type specific gravity bottle; and volume Za and Zb are as calculated from the number average particle diameter, as the volume of a true sphere calculated assuming that the particle is a true sphere having the number average particle diameter as the diameter. a hydrophobic solid particle A; and a hydrophobic solid particle B over a surface of the hydrophobic solid particle A, wherein a contact angle CAa of the hydrophobic solid particle A with water is 110 degrees or greater but 180 degrees or less, wherein a contact angle CAb of the hydrophobic solid particle B with water is 110 degrees or greater but 180 degrees or less, wherein a ratio (d50a/d50b) of a number average particle diameter d50a of the hydrophobic solid particle A to a number average particle diameter d50b of the hydrophobic solid particle B is 10 or greater but 100 or less, and wherein a coating ratio CR of the composite particles expressed by Formula 1 below is 50% or higher but 500% or lower, Coating ratio CR % = π d 50 b / 2 2 4 π d 50 a / 2 + d 50 b / 2 2 × X b g / Y b g / μm 3 / Z b μm 3 X a g / Y a g / μm 3 / Z a μm 3 × 100 where in Formula 1, Xa represents a mass (g) of the hydrophobic solid particle A, Xb represents a mass (g) of the hydrophobic solid particle B, Ya represents a density (g/cubic micrometer) of the hydrophobic solid particle A, Yb represents a density (g/cubic micrometer) of the hydrophobic solid particle B, Za represents a volume (cubic micrometer) of the hydrophobic solid particle A, and Zb represents a volume (cubic micrometer) of the hydrophobic solid particle B, wherein contact angle CAa and CAb are measured as follows: a plate-shaped body obtained by hot-pressing the material constituting the solid particles A or B or a plate-shaped body obtained by casting a dispersion liquid of the material constituting the solid particles A or B over a substrate is used as the sample to be measured, and the angle formed between the liquid surface of water and the surface of the plate-shaped body when the water is located in an amount of 10 microliters over the sample with a microsyringe is measured as the contact angle CAa or CAb with the water; number average particle diameter d50a and d50b are measured as follows: an image of each of the solid particles A and B isolated is taken with a scanning electron microscope, and the average of longest diameters of ten particles arbitrarily selected from the taken electron microscopic image is calculated as the number average particle diameter of each; mass Xa and Xb are as measured with a precision balance; density Ya and Yb are as measured with a Gay-Lussac type specific gravity bottle; and volume Za and Zb are as calculated from the number average particle diameter, as the volume of a true sphere calculated assuming that the particle is a true sphere having the number average particle diameter as the diameter.