A positive electrode material for lithium ion secondary batteries, comprising inorganic particles whose surfaces are coated with a carbonaceous film, characterized in that: the positive electrode material is obtainable by a production method comprising: a first step of heating a liquid material in an airtight container, the liquid material containing a Li compound, an Fe compound, a Mn compound, an M compound (where M represents at least one selected from the group consisting of Mg, Ca, Co, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, and rare earth elements) and at least one of a P compound and a S compound; and a second step of performing a heat treatment on a solid material in a non-oxidative atmosphere, the solid material being obtained by drying a slurry containing a reaction product, which is obtained in the first step, an organic compound and a surfactant, in that the inorganic particles are represented by a formula LiFe x Mn 1-x-y MyPO 4 (0.05≤x≤1.0, 0≤y≤0.14, where M represents at least one selected from the group consisting of Mg, Ca, Co, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, and rare earth elements), in that the amount of carbon forming the carboneaceous film is in a range from 0.8 parts by mass to 2.5 parts by mass with respect to 100 parts by mass of the inorganic particles, and in that the positive electrode material has: a specific surface area in a range from 6 m 2 /g to 20 m 2 /g, a lightness L* in a range from 0 to 40, and a chroma C* in a range from 0 to 3.5. the positive electrode material is obtainable by a production method comprising: a first step of heating a liquid material in an airtight container, the liquid material containing a Li compound, an Fe compound, a Mn compound, an M compound (where M represents at least one selected from the group consisting of Mg, Ca, Co, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, and rare earth elements) and at least one of a P compound and a S compound; and a second step of performing a heat treatment on a solid material in a non-oxidative atmosphere, the solid material being obtained by drying a slurry containing a reaction product, which is obtained in the first step, an organic compound and a surfactant, a first step of heating a liquid material in an airtight container, the liquid material containing a Li compound, an Fe compound, a Mn compound, an M compound (where M represents at least one selected from the group consisting of Mg, Ca, Co, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, and rare earth elements) and at least one of a P compound and a S compound; and a second step of performing a heat treatment on a solid material in a non-oxidative atmosphere, the solid material being obtained by drying a slurry containing a reaction product, which is obtained in the first step, an organic compound and a surfactant, in that the inorganic particles are represented by a formula LiFe x Mn 1-x-y MyPO 4 (0.05≤x≤1.0, 0≤y≤0.14, where M represents at least one selected from the group consisting of Mg, Ca, Co, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, and rare earth elements), in that the amount of carbon forming the carboneaceous film is in a range from 0.8 parts by mass to 2.5 parts by mass with respect to 100 parts by mass of the inorganic particles, and in that the positive electrode material has: a specific surface area in a range from 6 m 2 /g to 20 m 2 /g, a lightness L* in a range from 0 to 40, and a chroma C* in a range from 0 to 3.5. a specific surface area in a range from 6 m 2 /g to 20 m 2 /g, a lightness L* in a range from 0 to 40, and a chroma C* in a range from 0 to 3.5.