A physical quantity sensor comprising: a substrate; a movable body provided with an opening portion; and a support portion that supports the movable body, and is disposed in the opening portion, in plan view, wherein the support portion includes a first fixed portion and a second fixed portion that are fixed to the substrate; a first beam portion and a second beam portion that each connect the first fixed portion with the second fixed portion and are provided apart from each other; a third beam portion that connects the first beam portion with the movable body in plan view; and a fourth beam portion that connects the second beam portion with the movable body in plan view, wherein the movable body is displaceable, with the third beam portion and the fourth beam portion as rotation axes, wherein the movable body includes, in plan view, with the rotation axis as a boundary, a first movable portion located on one side in a direction orthogonal to the rotation axis; a second movable portion located on the other side in the orthogonal direction; and a fifth beam portion and a sixth beam portion that each connect the first movable portion with the second movable portion, wherein the opening portion is disposed, in plan view, between the fifth beam portion and the sixth beam portion, wherein the third beam portion connects the first beam portion with the fifth beam portion, and wherein the fourth beam portion connects the second beam portion with the sixth beam portion, wherein the first beam portion and the second beam portion are disposed between the fifth beam portion and the sixth beam portion in plan view, characterized in that a further opening portion is defined by the first and second fixed portion (32, 34) and the first and second beam portions (41, 42). a substrate; a movable body provided with an opening portion; and a support portion that supports the movable body, and is disposed in the opening portion, in plan view, wherein the support portion includes a first fixed portion and a second fixed portion that are fixed to the substrate; a first beam portion and a second beam portion that each connect the first fixed portion with the second fixed portion and are provided apart from each other; a third beam portion that connects the first beam portion with the movable body in plan view; and a fourth beam portion that connects the second beam portion with the movable body in plan view, a first fixed portion and a second fixed portion that are fixed to the substrate; a first beam portion and a second beam portion that each connect the first fixed portion with the second fixed portion and are provided apart from each other; a third beam portion that connects the first beam portion with the movable body in plan view; and a fourth beam portion that connects the second beam portion with the movable body in plan view, wherein the movable body is displaceable, with the third beam portion and the fourth beam portion as rotation axes, wherein the movable body includes, in plan view, with the rotation axis as a boundary, a first movable portion located on one side in a direction orthogonal to the rotation axis; a second movable portion located on the other side in the orthogonal direction; and a fifth beam portion and a sixth beam portion that each connect the first movable portion with the second movable portion, a first movable portion located on one side in a direction orthogonal to the rotation axis; a second movable portion located on the other side in the orthogonal direction; and a fifth beam portion and a sixth beam portion that each connect the first movable portion with the second movable portion, wherein the opening portion is disposed, in plan view, between the fifth beam portion and the sixth beam portion, wherein the third beam portion connects the first beam portion with the fifth beam portion, and wherein the fourth beam portion connects the second beam portion with the sixth beam portion, wherein the first beam portion and the second beam portion are disposed between the fifth beam portion and the sixth beam portion in plan view, characterized in that a further opening portion is defined by the first and second fixed portion (32, 34) and the first and second beam portions (41, 42).