A physical quantity sensor comprising a substrate ; a fixed section fixed to the substrate ; a movable section displaceable in a first direction with respect to the fixed section ; a movable electrode section provided in the movable section ; a fixed electrode section fixed to the substrate and disposed to be opposed to the movable electrode section in the first direction; and a restricting section configured to restrict a movable range in the first direction of the movable section , wherein the movable section includes: a first outer edge portion disposed on the first direction plus side of the fixed section along a second direction orthogonal to the first direction; and a second outer edge portion disposed on the first direction minus side of the fixed section along the second direction, and the restricting section includes at least one of: a first restricting section disposed to be opposed to the first outer edge portion via a gap on a side of the first outer edge portion opposite to a side of the fixed section ; and a second restricting section disposed to be opposed to the second outer edge portion via a gap on a side of the second outer edge portion opposite to a side of the fixed section , wherein the first restricting section is disposed to extend along an outer edge of the first outer edge portion , and the second restricting section is disposed to extend along an outer edge of the second outer edge portion , characterized in that at least one of the first restricting section and the second restricting section includes a slit and a beam section and thus has elasticity in the first direction. a fixed section fixed to the substrate ; a movable section displaceable in a first direction with respect to the fixed section ; a movable electrode section provided in the movable section ; a fixed electrode section fixed to the substrate and disposed to be opposed to the movable electrode section in the first direction; and a restricting section configured to restrict a movable range in the first direction of the movable section , wherein the movable section includes: a first outer edge portion disposed on the first direction plus side of the fixed section along a second direction orthogonal to the first direction; and a second outer edge portion disposed on the first direction minus side of the fixed section along the second direction, and a first outer edge portion disposed on the first direction plus side of the fixed section along a second direction orthogonal to the first direction; and a second outer edge portion disposed on the first direction minus side of the fixed section along the second direction, and the restricting section includes at least one of: a first restricting section disposed to be opposed to the first outer edge portion via a gap on a side of the first outer edge portion opposite to a side of the fixed section ; and a second restricting section disposed to be opposed to the second outer edge portion via a gap on a side of the second outer edge portion opposite to a side of the fixed section , wherein a first restricting section disposed to be opposed to the first outer edge portion via a gap on a side of the first outer edge portion opposite to a side of the fixed section ; and a second restricting section disposed to be opposed to the second outer edge portion via a gap on a side of the second outer edge portion opposite to a side of the fixed section , wherein the first restricting section is disposed to extend along an outer edge of the first outer edge portion , and the second restricting section is disposed to extend along an outer edge of the second outer edge portion , characterized in that at least one of the first restricting section and the second restricting section includes a slit and a beam section and thus has elasticity in the first direction. <EOS>