A strain gauge comprising: a substrate having insulating properties; a resistive body that is disposed on a main surface of the substrate, has electric conductivity, and is configured to stretch and contract in accordance with deformation of the substrate; and a metal sheet that covers the main surface of the substrate, wherein the resistive body includes, a sensing portion a resistance value of which varies in accordance with deformation of the substrate, a first connection portion which is connected to one end of the sensing portion, and to which a wiring to an external circuit is connected at a first connection site provided in the first connection portion, and a second connection portion which is connected to the other end of the sensing portion, and to which a wiring to the external circuit is connected at a second connection site provided in the second connection portion, the metal sheet covers at least the substrate exposed between the first connection site, the second connection site and the sensing portion, the sensing portion, the first connection site and the second connection site are disposed to be spaced apart from each other in the first direction, the first connection site of the first connection portion and the second connection site of the second connection portion are provided in parallel in a second direction intersecting the first direction, and the metal sheet covers two outer edges of the main surface of the substrate in the second direction, and an outer edge on a side opposite to a side where the two connection sites are disposed in the first direction, characterized by an insulating sheet disposed on the resistive body, located between the resistive body and the metal sheet and having insulating properties, wherein the insulating sheet has a shape corresponding to a shape of the resistive body and a size capable of covering the entirety of the resistive body. a substrate having insulating properties; a resistive body that is disposed on a main surface of the substrate, has electric conductivity, and is configured to stretch and contract in accordance with deformation of the substrate; and a metal sheet that covers the main surface of the substrate, wherein the resistive body includes, a sensing portion a resistance value of which varies in accordance with deformation of the substrate, a first connection portion which is connected to one end of the sensing portion, and to which a wiring to an external circuit is connected at a first connection site provided in the first connection portion, and a second connection portion which is connected to the other end of the sensing portion, and to which a wiring to the external circuit is connected at a second connection site provided in the second connection portion, a sensing portion a resistance value of which varies in accordance with deformation of the substrate, a first connection portion which is connected to one end of the sensing portion, and to which a wiring to an external circuit is connected at a first connection site provided in the first connection portion, and a second connection portion which is connected to the other end of the sensing portion, and to which a wiring to the external circuit is connected at a second connection site provided in the second connection portion, the metal sheet covers at least the substrate exposed between the first connection site, the second connection site and the sensing portion, the sensing portion, the first connection site and the second connection site are disposed to be spaced apart from each other in the first direction, the first connection site of the first connection portion and the second connection site of the second connection portion are provided in parallel in a second direction intersecting the first direction, and the metal sheet covers two outer edges of the main surface of the substrate in the second direction, and an outer edge on a side opposite to a side where the two connection sites are disposed in the first direction, characterized by an insulating sheet disposed on the resistive body, located between the resistive body and the metal sheet and having insulating properties, wherein the insulating sheet has a shape corresponding to a shape of the resistive body and a size capable of covering the entirety of the resistive body.