To provide an energy ray curing type elastomer composition giving an elastomer cured product capable of increasing an inter-crosslinked point molecular weight without changing the kind of the energy ray curing type compound before curing and making breaking elongation and processability compatible.

The energy ray curing type elastomer composition includes (A) the energy ray curing type compound having a (meth)acryloyl group and (B) a polythiol compound having 2-6 mercapto groups in the molecule. The energy ray curing type elastomer composition is characterized in that the functional group number ratio of the (meth)acryloyl group in the composition and the mercapto group in the component (B) is 100:0.1-100:5n (n is the number of the mercapto group in one molecule of the polythiol compound).

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