A compound comprising: a metal element-containing powder; and a resin composition, wherein a content of the metal element-containing powder is 90% by mass or more and less than 100% by mass. a glass transition temperature of a cured product of the compound is represented as Tg [°C], a thermal expansion rate of the cured product of the compound at 25°C or higher and lower than T g [°C] is represented as CTE1 [ppm/°C], a thermal expansion rate of the cured product of the compound at Tg°C or higher and 250°C or lower is represented as CTE2 [ppm/°C], a bending elastic modulus of the cured product of the compound at 250°C is represented as E [GPa], a bending strength of the cured product of the compound at 250°C is represented as σ [MPa], a stress index SI of the cured product of the compound defined by mathematical formula below is 0 or more and 150 or less: SI = CTE 1 × Tg − 25 + CTE 2 × 250 − Tg − 17 × 250 − 25 × E / σ a bending elongation rate of the cured product of the compound at 250°C is represented as ε [%], and a fracture index FI defined by mathematical formula below is 3.0 MPa or more and 10.0 MPa or less: FI = ε × σ / 2 a three-point support type bending test is executed with respect to a test piece by using an autograph equipped with a thermostat bath, the test piece is a rectangular parallelepiped consisting of the cured product of the compound, a dimension of the test piece is longitudinal width L × transverse width W × thickness t, a temperature of the thermostat bath is 250°C, one surface of the test piece is supported by two support points in the three-point support type bending test, a load is applied to the center position between the two support points in the other surface of the test piece, a load when the test piece is broken and deflection of the test piece immediately before the test piece is broken are measured, P is the load when the test piece is broken, Lv [mm] is a distance between the two support points, W [mm] is the transverse width of the test piece, t [mm] is the thickness of the test piece, F/Y [N/m] is a gradient of a straight-line segment of a load-deflection curve measured by the three-point support type bending test, s [mm] is the deflection of the test piece immediately before the test piece is broken, the bending strength is calculated on the basis of mathematical formula below: σ = 3 × P × Lv / 2 × W × t 2 the bending elastic modulus is calculated on the basis of mathematical formula below: E = Lv 3 / 4 × W × t 3 × F / Y the bending elongation rate is calculated on the basis of mathematical formula below: ε = 600 × s × t / Lv 2 a metal element-containing powder; and a resin composition, wherein a content of the metal element-containing powder is 90% by mass or more and less than 100% by mass. a glass transition temperature of a cured product of the compound is represented as Tg [°C], a thermal expansion rate of the cured product of the compound at 25°C or higher and lower than T g [°C] is represented as CTE1 [ppm/°C], a thermal expansion rate of the cured product of the compound at Tg°C or higher and 250°C or lower is represented as CTE2 [ppm/°C], a bending elastic modulus of the cured product of the compound at 250°C is represented as E [GPa], a bending strength of the cured product of the compound at 250°C is represented as σ [MPa], a stress index SI of the cured product of the compound defined by mathematical formula below is 0 or more and 150 or less: SI = CTE 1 × Tg − 25 + CTE 2 × 250 − Tg − 17 × 250 − 25 × E / σ a bending elongation rate of the cured product of the compound at 250°C is represented as ε [%], and a fracture index FI defined by mathematical formula below is 3.0 MPa or more and 10.0 MPa or less: FI = ε × σ / 2 a three-point support type bending test is executed with respect to a test piece by using an autograph equipped with a thermostat bath, the test piece is a rectangular parallelepiped consisting of the cured product of the compound, a dimension of the test piece is longitudinal width L × transverse width W × thickness t, a temperature of the thermostat bath is 250°C, one surface of the test piece is supported by two support points in the three-point support type bending test, a load is applied to the center position between the two support points in the other surface of the test piece, a load when the test piece is broken and deflection of the test piece immediately before the test piece is broken are measured, P is the load when the test piece is broken, Lv [mm] is a distance between the two support points, W [mm] is the transverse width of the test piece, t [mm] is the thickness of the test piece, F/Y [N/m] is a gradient of a straight-line segment of a load-deflection curve measured by the three-point support type bending test, s [mm] is the deflection of the test piece immediately before the test piece is broken, the bending strength is calculated on the basis of mathematical formula below: σ = 3 × P × Lv / 2 × W × t 2 the bending elastic modulus is calculated on the basis of mathematical formula below: E = Lv 3 / 4 × W × t 3 × F / Y the bending elongation rate is calculated on the basis of mathematical formula below: ε = 600 × s × t / Lv 2