A multi-axial angular velocity sensor comprising: a package comprising a substrate part, the substrate part comprising a first surface perpendicular to a third axis among a first axis, second axis, and the third axis which are perpendicular to each other, an outer edge of the first surface comprising a pair of long sides parallel to the second axis and a pair of short sides parallel to the first axis; a first axial element which is mounted on the first surface and is configured to detect an angular velocity about the first axis; a second axial element which is mounted on the first surface and is configured to detect the angular velocity about the second axis; and a third axial element which is mounted on the first surface and is configured to detect the angular velocity about the third axis; wherein each of the first axial element, the second axial element, and the third axial element comprises: a piezoelectric body comprising a plurality of arms (63, 65) extending in a predetermined direction of extension in a plan perspective of the first surface and having the predetermined direction of extension as a long direction of the piezoelectric body, an excitation electrode (53A, 53B) on a portion of the plurality of arms, and a detecting electrode on another portion of the plurality of arms; wherein two axial elements of the first axial element, the second axial element, and the third axial element are arranged side by side in a direction along the pair of short sides with orientations so that the direction of extension of each of the two axial elements are parallel to the pair of long sides, and a remaining one axial element of the first axial element, the second axial element, and the third axial element is arranged in a direction along the pair of long sides relative to the two axial elements with an orientation so that the direction of extension is parallel to the pair of short sides, or three axial elements of the first axial element, the second axial element, and the third axial element are arranged side by side in directions along the pair of long sides with orientations so that the directions of extension become parallel to the pair of short sides; and characterized in that the substrate part comprises a reference potential pattern which is shared by the first axial element, the second axial element, and the third axial element. a package comprising a substrate part, the substrate part comprising a first surface perpendicular to a third axis among a first axis, second axis, and the third axis which are perpendicular to each other, an outer edge of the first surface comprising a pair of long sides parallel to the second axis and a pair of short sides parallel to the first axis; a first axial element which is mounted on the first surface and is configured to detect an angular velocity about the first axis; a second axial element which is mounted on the first surface and is configured to detect the angular velocity about the second axis; and a third axial element which is mounted on the first surface and is configured to detect the angular velocity about the third axis; wherein each of the first axial element, the second axial element, and the third axial element comprises: a piezoelectric body comprising a plurality of arms (63, 65) extending in a predetermined direction of extension in a plan perspective of the first surface and having the predetermined direction of extension as a long direction of the piezoelectric body, an excitation electrode (53A, 53B) on a portion of the plurality of arms, and a detecting electrode on another portion of the plurality of arms; a piezoelectric body comprising a plurality of arms (63, 65) extending in a predetermined direction of extension in a plan perspective of the first surface and having the predetermined direction of extension as a long direction of the piezoelectric body, an excitation electrode (53A, 53B) on a portion of the plurality of arms, and a detecting electrode on another portion of the plurality of arms; wherein two axial elements of the first axial element, the second axial element, and the third axial element are arranged side by side in a direction along the pair of short sides with orientations so that the direction of extension of each of the two axial elements are parallel to the pair of long sides, and a remaining one axial element of the first axial element, the second axial element, and the third axial element is arranged in a direction along the pair of long sides relative to the two axial elements with an orientation so that the direction of extension is parallel to the pair of short sides, or three axial elements of the first axial element, the second axial element, and the third axial element are arranged side by side in directions along the pair of long sides with orientations so that the directions of extension become parallel to the pair of short sides; and characterized in that the substrate part comprises a reference potential pattern which is shared by the first axial element, the second axial element, and the third axial element.