A metal powder, which is a platinum- or platinum alloy-containing metal powder for an electrically conductive paste, wherein the platinum alloy consists of Pt and at least one metal alloyed with Pt, the content of Pt in the platinum alloy being 40 mass% or more, the powder contains, as the metal element, metal elements other than Pt, the metal elements other than Pt contain at least Ca and may further contain Al and Zr, out of metal elements other than Pt, the total of the contents of Ca, Al and Zr is from 30 to 900 ppm by mass, the content of the platinum or platinum alloy in the metal powder is 98.0 mass% or more relative to the total of the metal powder excluding the content of Ca, and the metal powder meets the following the conditions (i) or (ii): (i) the content of Ca as a metal element included in the platinum or platinum alloy is from 30 to 60 ppm by mass and at the same time, the total of the contents of Ca, Al and Zr which are not included in the platinum or platinum alloy is from 10 to 500 ppm by mass, wherein the content of Ca, Al and Zr which are not included in the platinum or platinum alloy is determined as indicated in the description and is an amount of Ca, Al and Zr which can be eluted at the time of being dispersed in a dilute acid incapable of dissolving a noble metal, or (ii) the content of Ca as a metal element included in the platinum or platinum alloy is from 30 to 150 ppm by mass and at the same time, the powder contains Al and/or Zr which are not included in the platinum or platinum alloy, wherein Al and/or Zr which are not included in the platinum or platinum alloy is determined as indicated in the description and is Al and/or Zr which can be eluted at the time of being dispersed in a dilute acid incapable of dissolving a noble metal. the platinum alloy consists of Pt and at least one metal alloyed with Pt, the content of Pt in the platinum alloy being 40 mass% or more, the powder contains, as the metal element, metal elements other than Pt, the metal elements other than Pt contain at least Ca and may further contain Al and Zr, out of metal elements other than Pt, the total of the contents of Ca, Al and Zr is from 30 to 900 ppm by mass, the content of the platinum or platinum alloy in the metal powder is 98.0 mass% or more relative to the total of the metal powder excluding the content of Ca, and the metal powder meets the following the conditions (i) or (ii): (i) the content of Ca as a metal element included in the platinum or platinum alloy is from 30 to 60 ppm by mass and at the same time, the total of the contents of Ca, Al and Zr which are not included in the platinum or platinum alloy is from 10 to 500 ppm by mass, wherein the content of Ca, Al and Zr which are not included in the platinum or platinum alloy is determined as indicated in the description and is an amount of Ca, Al and Zr which can be eluted at the time of being dispersed in a dilute acid incapable of dissolving a noble metal, or (ii) the content of Ca as a metal element included in the platinum or platinum alloy is from 30 to 150 ppm by mass and at the same time, the powder contains Al and/or Zr which are not included in the platinum or platinum alloy, wherein Al and/or Zr which are not included in the platinum or platinum alloy is determined as indicated in the description and is Al and/or Zr which can be eluted at the time of being dispersed in a dilute acid incapable of dissolving a noble metal. (i) the content of Ca as a metal element included in the platinum or platinum alloy is from 30 to 60 ppm by mass and at the same time, the total of the contents of Ca, Al and Zr which are not included in the platinum or platinum alloy is from 10 to 500 ppm by mass, wherein the content of Ca, Al and Zr which are not included in the platinum or platinum alloy is determined as indicated in the description and is an amount of Ca, Al and Zr which can be eluted at the time of being dispersed in a dilute acid incapable of dissolving a noble metal, or (ii) the content of Ca as a metal element included in the platinum or platinum alloy is from 30 to 150 ppm by mass and at the same time, the powder contains Al and/or Zr which are not included in the platinum or platinum alloy, wherein Al and/or Zr which are not included in the platinum or platinum alloy is determined as indicated in the description and is Al and/or Zr which can be eluted at the time of being dispersed in a dilute acid incapable of dissolving a noble metal.