PROBLEM TO BE SOLVED: To provide a high-efficient red phosphor and a production method of the red phosphor.SOLUTION: The red phosphor contains an element A, europium (Eu), silicon (Si), carbon (C), oxygen (O), and nitrogen (N), at an atomic ratio of composition formula (1) below; and in a photoluminescence excitation (PLE) spectrum of the red phosphor, a relative value of luminescence intensity at an excitation wavelength of 550 nm is 0.85 or less and 0.55 or more when the luminescence intensity at an excitation wavelength of 400 nm is defined as 1. In the formula (1), element A is at least one of magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba); and m, x, y, and n satisfy relationships of 3