The present invention provides a curable liquid resin composition which, when cured, exhibits excellent removability from an adjacent coating layer and is suitable as an optical fiber upjacket material. The curable liquid resin optical fiber upjacket composition comprising a urethane(meth)acrylate or a (meth)acrylate oligomer containing two or more (meth)acryloyl groups, a reactive diluent, a polymerization initiator, and a urethane(meth)acrylate compound containing at least one (meth)acryloyl group and selected from (D1) to (D4) shown by the following general formula (1). (DI) In the formula (1), R1 represents a methyl group, R2 and R3 individually represent a divalent organic group, and R4 represents a monovalent organic group. (D2) In the formula (1), R1 represents a hydrogen atom, R2 and R3 individually represent divalent organic groups, and R4 represents a polyol residue having a molecular weight of 1500 or more. (D3) In the formula (1), R1 represents a hydrogen atom or a methyl group, R2 and R3 individually represent divalent organic groups, and R4 represents a silicone residue having a molecular weight of 1000 to 30000. (D4) In the formula (1), R1 represents a hydrogen atom, R2 and R3 individually represent divalent organic groups, and R4 represents a polyol monoalkyl ether residue having a molecular weight of 500 to 20000.