An electromagnetic flowmeter comprising: an exciting coil for forming a magnetic field in a direction perpendicular to a flow direction of fluid flowing through an inside of a measuring pipe; a signal electrode which faces a direction perpendicular to the magnetic field formed by the exciting coil, and which is provided on an inner circumference face of the measuring pipe, wherein an electromotive force, which is generated in use in the fluid flowing through the inside of the measuring pipe due to the magnetic field formed by the exciting coil, may be taken out by the signal electrodes, wherein the signal electrode comprises an electrode section which is arranged to be in contact with the fluid and an axis portion provided on a rear face of the electrode section which faces an inner circumference face of the measuring pipe, wherein a first member, which has elasticity, and a second member which is harder than the first member are inserted between the rear face of the electrode section and the inner circumference face of the measuring pipe, and wherein the axis portion is projected to an outer circumference face of the measuring pipe through a through hole which is formed between the inner circumference face of the measuring pipe and an outer circumference face thereof, and a fastening member is fastened on the axis portion which projects to the outer circumference face of the measuring pipe, so that the first member is sandwiched between the rear face of the electrode section and the inner circumference face of the measuring pipe so as to be elastically deformed, whereby the signal electrode is attached to the inner circumference face of the measuring pipe, characterised by a ring shape dividing wall (4a1) which is harder than the second member inserted between the rear face of the electrode section and the inner circumference face of the measuring pipe, in a state where the ring shape dividing wall is sandwiched between the first member and the second member. an exciting coil for forming a magnetic field in a direction perpendicular to a flow direction of fluid flowing through an inside of a measuring pipe; a signal electrode which faces a direction perpendicular to the magnetic field formed by the exciting coil, and which is provided on an inner circumference face of the measuring pipe, wherein an electromotive force, which is generated in use in the fluid flowing through the inside of the measuring pipe due to the magnetic field formed by the exciting coil, may be taken out by the signal electrodes, wherein the signal electrode comprises an electrode section which is arranged to be in contact with the fluid and an axis portion provided on a rear face of the electrode section which faces an inner circumference face of the measuring pipe, wherein a first member, which has elasticity, and a second member which is harder than the first member are inserted between the rear face of the electrode section and the inner circumference face of the measuring pipe, and wherein the axis portion is projected to an outer circumference face of the measuring pipe through a through hole which is formed between the inner circumference face of the measuring pipe and an outer circumference face thereof, and a fastening member is fastened on the axis portion which projects to the outer circumference face of the measuring pipe, so that the first member is sandwiched between the rear face of the electrode section and the inner circumference face of the measuring pipe so as to be elastically deformed, whereby the signal electrode is attached to the inner circumference face of the measuring pipe, characterised by a ring shape dividing wall (4a1) which is harder than the second member inserted between the rear face of the electrode section and the inner circumference face of the measuring pipe, in a state where the ring shape dividing wall is sandwiched between the first member and the second member.