A ferritic stainless steel sheet exhibiting small increase in strength after aging heat treatment, consisting of, as a steel composition, by mass%: C: 0.0005% to 0.020%; Si: 0.01% to 2.0%; Mn: 0.01% to 2.0%; P: 0.005% or more and less than 0.050%; S: 0.0002% or more and less than 0.010%; Cr: 10.0% to 25.0%; N: 0.0005% to 0.020%; Sn: 0.010% to 0.22%; and one or more of Ti: 0.03% to 0.60%, Nb: 0.03% to 0.60%, V: 0.03% to 0.60%, Zr: 0.03% to 0.60%, and optionally Al: 0.003% to 1.0%, and optionally one or more of, Ni: 0.01% to 2.0%, Cu: 0.01% to 2.0%, Mo: 0.01% to 2.0%, and optionally one or more of, B: 0.0003% to 0.0025%, Mg: 0.0001% to 0.0030%, Ca: 0.0003% to 0.0030%, Sb: 0.001% to 0.50%, Ga: 0.0003% to 0.1%, REM (rare earth metal): 0.002% to 0.2%, and Ta: 0.005% to 0.50% so as to satisfy the following Equation; and a balance consisting of Fe and inevitable impurities, wherein stress σ1 (N/mm 2) and upper yield stress σ2 (N/mm 2) satisfy the following Equation: Ti / 48 + V / 51 + Zr / 91 + Nb / 93 / C / 12 + N / 14 ≥ 1.0 σ 2 − σ 1 ≤ 8 wherein in Equation, each element name represents the amount (mass%) thereof and the amount of an element not contained in the steel is substituted by 0; and wherein stress σ1 (N/mm 2) and upper yield stress σ2 (N/mm 2) are measured by the following method: taking a tensile test piece from the steel sheet in a direction parallel to a rolling direction; subjecting the tensile test piece to prestrain imparting tensile deformation with 7.5% of strain to measure the stress σ1; subjecting the tensile test piece to a heat treatment at 200°C for 30 minutes; and subjecting the tensile test piece to tension again to measure the upper yield stress σ2, wherein JIS 13B tensile test pieces according to JIS Z 2241: 2011 corresponding to ISO 6892-1: 2009 are used as tensile test pieces, and the tension rate during the tensile test is set to in a range of 1 mm/min to 3 mm/min, and other conditions are set according to JIS Z 2241. C: 0.0005% to 0.020%; Si: 0.01% to 2.0%; Mn: 0.01% to 2.0%; P: 0.005% or more and less than 0.050%; S: 0.0002% or more and less than 0.010%; Cr: 10.0% to 25.0%; N: 0.0005% to 0.020%; Sn: 0.010% to 0.22%; and one or more of Ti: 0.03% to 0.60%, Nb: 0.03% to 0.60%, V: 0.03% to 0.60%, Zr: 0.03% to 0.60%, and optionally Al: 0.003% to 1.0%, and optionally one or more of, Ni: 0.01% to 2.0%, Cu: 0.01% to 2.0%, Mo: 0.01% to 2.0%, and optionally one or more of, B: 0.0003% to 0.0025%, Mg: 0.0001% to 0.0030%, Ca: 0.0003% to 0.0030%, Sb: 0.001% to 0.50%, Ga: 0.0003% to 0.1%, REM (rare earth metal): 0.002% to 0.2%, and Ta: 0.005% to 0.50% so as to satisfy the following Equation; and a balance consisting of Fe and inevitable impurities, wherein in Equation, each element name represents the amount (mass%) thereof and the amount of an element not contained in the steel is substituted by 0; and wherein stress σ1 (N/mm 2) and upper yield stress σ2 (N/mm 2) are measured by the following method: taking a tensile test piece from the steel sheet in a direction parallel to a rolling direction; subjecting the tensile test piece to prestrain imparting tensile deformation with 7.5% of strain to measure the stress σ1; subjecting the tensile test piece to a heat treatment at 200°C for 30 minutes; and subjecting the tensile test piece to tension again to measure the upper yield stress σ2, wherein JIS 13B tensile test pieces according to JIS Z 2241: 2011 corresponding to ISO 6892-1: 2009 are used as tensile test pieces, and the tension rate during the tensile test is set to in a range of 1 mm/min to 3 mm/min, and other conditions are set according to JIS Z 2241. taking a tensile test piece from the steel sheet in a direction parallel to a rolling direction; subjecting the tensile test piece to prestrain imparting tensile deformation with 7.5% of strain to measure the stress σ1; subjecting the tensile test piece to a heat treatment at 200°C for 30 minutes; and subjecting the tensile test piece to tension again to measure the upper yield stress σ2, wherein JIS 13B tensile test pieces according to JIS Z 2241: 2011 corresponding to ISO 6892-1: 2009 are used as tensile test pieces, and the tension rate during the tensile test is set to in a range of 1 mm/min to 3 mm/min, and other conditions are set according to JIS Z 2241.