A process for producing an electrical wire molded body comprising: step I of melting and kneading 30 parts to 100 parts by weight of component (a): a polyethylene-based resin, 0 part to 40 parts by weight of component (b): a polypropylene-based resin, 0 part to 40 parts by weight of component (c): a block copolymer of an aromatic vinyl-based compound and a conjugated diene-based compound and/or a hydrogenated product thereof, 0 part to 15 parts by weight of component (d): an acid-modified resin, and 0 part to 30 parts by weight of component (e): a non-aromatic softening agent for rubber, provided that the total amount of the components (a), (b), (c), (d) and (e) is defined as 100 parts by weight, and 0.2 part to 1 part by weight of component (f): an organic peroxide, 1 part to 6 parts by weight of component (g): a silane coupling agent, and 50 parts to 250 parts by weight of component (h): a metal hydrate based on 100 parts by weight of the total amount of the components (a), (b), (c), (d) and (e), all at once, at a temperature equal to or higher than the reaction temperature of the component (f): organic peroxide, to produce component which is a silane crosslinkable flame retardant polyolefin; step II of melting and kneading 100 parts by weight of at least one polymer selected from the group consisting of the components (a), (b) and (c) and 0.1 part to 8 parts by weight of component (i): a silanol condensation catalyst, to produce component which is a silanol catalyst resin composition; and step III of mixing the components and in a weight ratio of: = 10:1 to 100:1, melt molding the mixture on a conductor and then crosslinking the molded body in the presence of water. step I of melting and kneading 30 parts to 100 parts by weight of component (a): a polyethylene-based resin, 0 part to 40 parts by weight of component (b): a polypropylene-based resin, 0 part to 40 parts by weight of component (c): a block copolymer of an aromatic vinyl-based compound and a conjugated diene-based compound and/or a hydrogenated product thereof, 0 part to 15 parts by weight of component (d): an acid-modified resin, and 0 part to 30 parts by weight of component (e): a non-aromatic softening agent for rubber, provided that the total amount of the components (a), (b), (c), (d) and (e) is defined as 100 parts by weight, and 0.2 part to 1 part by weight of component (f): an organic peroxide, 1 part to 6 parts by weight of component (g): a silane coupling agent, and 50 parts to 250 parts by weight of component (h): a metal hydrate based on 100 parts by weight of the total amount of the components (a), (b), (c), (d) and (e), all at once, at a temperature equal to or higher than the reaction temperature of the component (f): organic peroxide, to produce component which is a silane crosslinkable flame retardant polyolefin; step II of melting and kneading 100 parts by weight of at least one polymer selected from the group consisting of the components (a), (b) and (c) and 0.1 part to 8 parts by weight of component (i): a silanol condensation catalyst, to produce component which is a silanol catalyst resin composition; and step III of mixing the components and in a weight ratio of: = 10:1 to 100:1, melt molding the mixture on a conductor and then crosslinking the molded body in the presence of water.