Provided is an explosive composition for diamond synthesis by which diamond particles having a relatively large diameter can be produced. The explosive composition for diamond synthesis contains an explosive component, a carbon raw material that may be included as the explosive component, and diamond particles. Furthermore, the total proportion of the explosive component, the carbon raw material, and the diamond particles relative to the total amount of the explosive composition for diamond synthesis is 99 mass% or greater. The crystallite diameter of primary particles of the diamond particles as determined by the XRD method is preferably 100 nm or less.

Provided is an explosive composition for diamond synthesis by which diamond particles having a relatively large diameter can be produced. The explosive composition for diamond synthesis contains an explosive component, a carbon raw material that may be included as the explosive component, and diamond particles. Furthermore, the total proportion of the explosive component, the carbon raw material, and the diamond particles relative to the total amount of the explosive composition for diamond synthesis is 99 mass% or greater. The crystallite diameter of primary particles of the diamond particles as determined by the XRD method is preferably 100 nm or less.

Provided is an explosive body X, i.e., an explosive body for nanodiamond synthesis, includes at least an explosive main body (10) that includes a frustum part (11) and a columnar part (12). The frustum part (11) includes an upper bottom surface (11a) including an open end of a hole (H), in which a triggering unit is received, and an angled side surface (11b) forming an imaginary apex angle on the upper bottom surface (11a) side. The columnar part (12) is formed contiguous with the frustum part (11) on an opposite side of the frustum part (11) to the upper bottom surface (11a) of the frustum part (11) and extends in a direction away from the upper bottom surface (11a). The explosive body for nanodiamond synthesis is suitable for improving the yield in nanodiamond synthesis by a detonation method.