Altitude measurement device and portable object comprising the same

An altitude measurement device comprising:

• an atmospheric pressure sensor to be compressed or to expand in a rectilinear direction as a function of an atmospheric pressure to be measured which increases or decreases, wherein movements of deformation of the atmospheric pressure sensor are transformed, via a transmission system, into a pivoting motion, in a plane perpendicular to the rectilinear direction of the deformation of the atmospheric pressure sensor, of an activation system which drives pivoting of an indicator hand, wherein the indicator hand moves over a graduated circular scale, wherein
• the atmospheric pressure sensor is movable in one direction or in an opposite direction along the rectilinear direction of the deformation thereof relative to other components of the altitude measurement device, and wherein
• the atmospheric pressure sensor is mounted on a seat which is fixed in a recess in a support, the support is movable to move the atmospheric pressure sensor in the one direction or in the opposite direction along the rectilinear direction of the deformation relative to the other components of the altitude measurement device, and the support and a cover form a case of the altitude measurement device.