A flux-cored wire for gas-shielded arc welding comprising: an outer steel sheath; and a flux with which the outer steel sheath is filled, wherein one or more of CaF 2, BaF 2, SrF 2, MgF 2, and LiF, which are metal fluorides, are included in the flux-cored wire and, when a total amount thereof is defined as α, the α is 2.0% to 7.0%, by mass%, with respect to a total mass of the flux-cored wire, one or more of a Ti oxide, a Si oxide, a Mg oxide, an Al oxide, a Zr oxide, and a Ca oxide, which are metal oxides, are included in the flux-cored wire and, when a total amount thereof is defined as β, the β is 0.2% to 0.9%, by mass%, with respect to the total mass of the flux-cored wire, one or more of CaCO 3, BaCO 3, SrCO 3, MgCO 3, and Li 2 CO 3, which are metal carbonates, are included in the flux-cored wire and a total amount thereof is less than 0.6%, by mass%, with respect to the total mass of the flux-cored wire, a ratio of an amount of the CaF 2 with respect to the α is 0.90 or more, a ratio of the α with respect to the β is 3.0 or more and 15.0 or less, an amount of the Ti oxide is 0% to 0.4%, by mass%, with respect to the total mass of the flux-cored wire, an amount of the Si oxide is 0.2% to 0.5%, by mass%, with respect to the total mass of the flux-cored wire, an amount of the Ca oxide is less than 0.20%, by mass%, with respect to the total mass of the flux-cored wire, an amount of an arc stabilizer in the flux is 0% to 0.50%, by mass%, with respect to the total mass of the flux-cored wire, an amount of an iron powder in the flux is less than 5%, by mass%, with respect to the total mass of the flux-cored wire, chemical compositions except the metal fluorides, the metal oxides, and the metal carbonates consist of, by mass%, with respect to the total mass of the flux-cored wire, C: 0.003% to 0.040%; Si: 0.05% to 0.40%; Mn: 0.2% to 0.8%; Al: 0.003% to 0.050%; Ni: 6.0% to 16.0%; P: 0.02% or less; S: 0.01% or less; Cu: 0% to 0.5%; Cr: 0% to 0.5%; Mo: 0% to 0.5%; V: 0% to 0.2%; Ti: 0% to 0.1%; Nb: 0% to 0.1%; B: 0% to 0.01%; Mg: 0% to 0.6%; REM: 0 to 0.0500%; and a remainder: Fe and an impurity, a SM defined by the below expression a is 0.3% to 1.0%, a Ceq defined by the below expression b is 0.250% to 0.525%, SM = Si + Mn Ceq = C + 1 / 24 Si + 1 / 6 Mn + 1 / 40 Ni + 1 / 5 Cr + 1 / 4 Mo + 1 / 14 V and in the Expressions a and b, elements noted in brackets express amounts (mass%) of the elements, respectively. an outer steel sheath; and a flux with which the outer steel sheath is filled, wherein one or more of CaF 2, BaF 2, SrF 2, MgF 2, and LiF, which are metal fluorides, are included in the flux-cored wire and, when a total amount thereof is defined as α, the α is 2.0% to 7.0%, by mass%, with respect to a total mass of the flux-cored wire, one or more of a Ti oxide, a Si oxide, a Mg oxide, an Al oxide, a Zr oxide, and a Ca oxide, which are metal oxides, are included in the flux-cored wire and, when a total amount thereof is defined as β, the β is 0.2% to 0.9%, by mass%, with respect to the total mass of the flux-cored wire, one or more of CaCO 3, BaCO 3, SrCO 3, MgCO 3, and Li 2 CO 3, which are metal carbonates, are included in the flux-cored wire and a total amount thereof is less than 0.6%, by mass%, with respect to the total mass of the flux-cored wire, a ratio of an amount of the CaF 2 with respect to the α is 0.90 or more, a ratio of the α with respect to the β is 3.0 or more and 15.0 or less, an amount of the Ti oxide is 0% to 0.4%, by mass%, with respect to the total mass of the flux-cored wire, an amount of the Si oxide is 0.2% to 0.5%, by mass%, with respect to the total mass of the flux-cored wire, an amount of the Ca oxide is less than 0.20%, by mass%, with respect to the total mass of the flux-cored wire, an amount of an arc stabilizer in the flux is 0% to 0.50%, by mass%, with respect to the total mass of the flux-cored wire, an amount of an iron powder in the flux is less than 5%, by mass%, with respect to the total mass of the flux-cored wire, chemical compositions except the metal fluorides, the metal oxides, and the metal carbonates consist of, by mass%, with respect to the total mass of the flux-cored wire, C: 0.003% to 0.040%; Si: 0.05% to 0.40%; Mn: 0.2% to 0.8%; Al: 0.003% to 0.050%; Ni: 6.0% to 16.0%; P: 0.02% or less; S: 0.01% or less; Cu: 0% to 0.5%; Cr: 0% to 0.5%; Mo: 0% to 0.5%; V: 0% to 0.2%; Ti: 0% to 0.1%; Nb: 0% to 0.1%; B: 0% to 0.01%; Mg: 0% to 0.6%; REM: 0 to 0.0500%; and C: 0.003% to 0.040%; Si: 0.05% to 0.40%; Mn: 0.2% to 0.8%; Al: 0.003% to 0.050%; Ni: 6.0% to 16.0%; P: 0.02% or less; S: 0.01% or less; Cu: 0% to 0.5%; Cr: 0% to 0.5%; Mo: 0% to 0.5%; V: 0% to 0.2%; Ti: 0% to 0.1%; Nb: 0% to 0.1%; B: 0% to 0.01%; Mg: 0% to 0.6%; REM: 0 to 0.0500%; and a remainder: Fe and an impurity, a SM defined by the below expression a is 0.3% to 1.0%, a Ceq defined by the below expression b is 0.250% to 0.525%, SM = Si + Mn Ceq = C + 1 / 24 Si + 1 / 6 Mn + 1 / 40 Ni + 1 / 5 Cr + 1 / 4 Mo + 1 / 14 V and in the Expressions a and b, elements noted in brackets express amounts (mass%) of the elements, respectively.