Vibronic sensor, particularly one to generate Coriolis forces that depend on mass flow and/or to generate viscosity-dependent frictional forces in flowing fluids, said sensor comprising: - at least one measuring tube that has an inlet end and an outlet end and vibrates at least temporarily, said tube being designed to conduct a fluid -- wherein the measuring tube communicates with a connected pipe via a first tube segment that enters into the inlet end and via a second tube segment that enters into the outlet end so that the fluid can flow through the tube, and -- wherein, during operation, the measuring tube executes mechanical oscillations around an imaginary axis of oscillation that connects the two tube segments (11, 12), as well as - a support element designed to hold the measuring tube so that it is able to oscillate, -- with a first end section, which has a clearance opening, designed to fix the first tube segment in place, and -- with a second end section, which has a clearance opening, designed to fix the second tube segment in place - wherein one of the two tube segments or extends through each of the two clearance openings (21A, 22A) and each of the two clearance openings (21A, 22A) has an inner diameter that is greater than an outer diameter of the corresponding tube segment (21, 22), such that an intermediate space (21 B, 22B) is formed between the tube segment (21, 22) and the end section (11, 12), characterized in that at least a first, particularly metallic, spring body is fitted onto at least one of the two tube segments or, said spring body being arranged in the intermediate space (21 B, 22B) in such a way that it comes into contact with both the corresponding tube segment (11, 12) and the corresponding end section (21, 22) at least in sections in such a way that it is subject, at least in sections, to deformation forces acting radially and, due to resulting elastic deformations, it is kept pressed against the corresponding tube segment (11, 12) and the corresponding end section (21, 22), forming a frictional connection between the tube segment (11, 12) and the spring body as well as a frictional connection between the end section (21, 22) and the spring body, as a result of which the tube segment is firmly wedged in the corresponding clearance opening. - at least one measuring tube that has an inlet end and an outlet end and vibrates at least temporarily, said tube being designed to conduct a fluid -- wherein the measuring tube communicates with a connected pipe via a first tube segment that enters into the inlet end and via a second tube segment that enters into the outlet end so that the fluid can flow through the tube, and -- wherein, during operation, the measuring tube executes mechanical oscillations around an imaginary axis of oscillation that connects the two tube segments (11, 12), as well as -- wherein the measuring tube communicates with a connected pipe via a first tube segment that enters into the inlet end and via a second tube segment that enters into the outlet end so that the fluid can flow through the tube, and -- wherein, during operation, the measuring tube executes mechanical oscillations around an imaginary axis of oscillation that connects the two tube segments (11, 12), as well as - a support element designed to hold the measuring tube so that it is able to oscillate, -- with a first end section, which has a clearance opening, designed to fix the first tube segment in place, and -- with a second end section, which has a clearance opening, designed to fix the second tube segment in place -- with a first end section, which has a clearance opening, designed to fix the first tube segment in place, and -- with a second end section, which has a clearance opening, designed to fix the second tube segment in place - wherein one of the two tube segments or extends through each of the two clearance openings (21A, 22A) and each of the two clearance openings (21A, 22A) has an inner diameter that is greater than an outer diameter of the corresponding tube segment (21, 22), such that an intermediate space (21 B, 22B) is formed between the tube segment (21, 22) and the end section (11, 12),