To prevent a solid paste from falling off from a container.

In the slider 1 used in a solid paste delivery container 2, a cylindrical body 9 in which a screw lever 5 is screwed is provided to the central part on the mounting side of solid paste 7 of a plate body 8 through which the screw lever 5 pierces and a single or one or more locking projections 10 and 11 protruded outwardly are integrally formed to the cylindrical body 9 to form sliders 12 and 13. The locking projections 10 and 11 are formed so as to satisfy the formula 1: S0-SM≥S1+S2+...+Sn, wherein S0 is the area (cm2) of the upper surface of the plate body, S1, S2,..., Sn are the areas (cm2) of the undersurfaces of (n) locking projections, SM is the maximum area (cm2) among the areas of S1, S2,..., Sn and for the areas of S0, S1, S2,..., Sn the occupy part of the cylindrical body is excepted.