a in fig3 the gear formed concave convex portion 13 having the gear concave portion 17 and the gear convex portion 18 engages the rotation regulating portion 41 of the rotation regulating ring 4 on a plane so the rotary vessel 1 does not rotate 0037 fig5 shows the rotary vessel 1 in the upper stop point and fig6 is a sectional view along line b b in fig5 0038 fig7 shows a plan view of the rotation regulating ring 4 fig7 shows a state in which the rotation regulating portion 41 and the click elastic protrusion 45 are alternately arranged on a plane in this invention as described above a rotary vessel structure for a wristwatch case having a rotation function of the rotary vessel 1 different depending on a stop position was realized wherein when the rotary vessel 1 is positioned in the lower stop point the gear formed concave convex portion 13 engages the rotation regulating portion 41 of the rotation regulating ring 4 to prohibit the rotary vessel 1 from rotating while when the rotary vessel 1 is positioned in the upper stop point the meshing is released between the gear formed concave convex portion 13 and the rotation regulating portion 41 of the rotation regulating.