1. The tablet having a domed shape on the upper and lower horizontal surfaces of the cylindrical plate shape, while the domed shape on the upper and lower horizontal surfaces meets the following requirements (a), (b) and (c) to the cross-sectional shape, including the center line of the cylindrical plate-shaped: (a) each angle has an angle of 25 to 45 °, (b) each angle has a horizontal length of 0.30 to 1.0 mm and (c) the dome has a depth of 0.6 to 1.2 mm .2. The tablet according to claim 1, in which (a) each angle has an angle value from 28 to 40 °. The tablet according to claim 1, in which (b) each corner has a horizontal length of from 0.35 to 0.85 mm. The tablet according to claim 1, in which (c) the dome has a depth of from 0.65 to 1.1 mm. The tablet according to claim 1, in which the length (diameter) of the horizontal surface of the cross-sectional shape is from 7 to 11 mm. The tablet according to claim 1, which as a main component includes particles of magnesium oxide represented by the following formula (1): (MgZn) O, (1) where x is from 0 to 0.3.7. The tablet according to claim 1, in which the content of particles of magnesium oxide is from 85 to 95 wt.%. The tablet according to claim 1, which as a main component includes magnesium oxide particles having an average secondary particle diameter of from 0.5 to 25 microns. A tablet according to any one of claims 1 to 8, which is administered orally. 10. A tablet according to any one of claims 6 to 8, which is used for the purpose of laxative effect. 11. A tablet according to any one of claims 6 to 8, which is used for laxative effect and is administered orally. A pestle for tabletting solid particles that satisfies the following requirements (a), (b) and (c) :( a) each angle has an angle of 25 to 45 °, (b) each angle has1. Таблетка, имеющая куполообразную форму на верхней и нижней горизонтальных поверхностях цилиндрической пластинчатой формы, при этом куполообразная форма на верхней и нижней горизонтальных пов
