invention in the embodiment as shown in fig6 the top end surface 40 a of each throat vane 40 the top end 42 a of the throat outer peripheral wall 42 and the top surface of the horizontal part 44 are set at the same height in order to prevent abrasion in the throat inner peripheral wall 41 or the throat outer peripheral wall 4 in addition in the embodiment as shown in fig6 the top end surface 40 a of the throat vane 40 is formed into a horizontal surface in the background art vertical pulverizing apparatus as shown in fig8 the top end surface 40 a of the throat vane 40 is inclined to be higher on the outer side and the throat vane 40 has a shape in which the throat vane 40 protrudes more upward on the outer side than on the inner side thus the throat vane 40 is abraded easily on the outer side to thereby shorten the useful life of the throat vane 40 to solve this problem the top end surface 40 a of the throat vane 40 is formed into a horizontal surface in the embodiment it is desirable that the radial width length of the horizontal part 44 is at least 10 mm in consideration of the size of particles coal particles in the embodiment circulating inside the vertical pulverizing apparatus and the necessity to change the moving direction of the particles 68 falling down along the slope part 43 to a lateral direction fig2 is a sectional view of the vicinities of.