A MEMS device comprising: a first membrane structure (12; 12 1), wherein the first membrane structure (12; 12 1) comprises a reinforcement region (18; 18 1 -18 9), wherein the reinforcement region (18; 18 1 -18 9) has a larger layer thickness (22 2) than an adjoining region (24; 24 1 -24 2) of the first membrane structure (12; 12 1), and an electrode structure, wherein the electrode structure is vertically spaced apart from the first membrane structure (12; 12 1); characterized in that: the first membrane structure (12; 12 1) comprises a deflectable region (46; 46 1) and a clamped border region, wherein the clamped border region adjoins the deflectable region (46; 46 1) along a borderline of the deflectable region (46; 46 1), wherein the reinforcement region (18; 18 1 -18 9) of the first membrane structure (12; 12 1) is arranged at the borderline; or the MEMS device comprises a second membrane structure (12 2), wherein the electrode structure is arranged between the first and second membrane structures(12 1 -12 2), wherein the first and second membrane structures (12 1 -12 2) each comprise a deflectable portion (46 1 -46 2), and wherein the deflectable portions (46 1 -46 2) of the first and second membrane structures (12 1 -12 2) are mechanically coupled by means of at least one mechanical connection element (54 1 -54 3) to each other and are mechanically decoupled from the electrode structure; wherein at least one of the first and second membrane structure (12 1 -12 2) comprises a reinforcement region (18; 18 1 -18 9) at a coupling position with the at least one mechanical connection element. a first membrane structure (12; 12 1), wherein the first membrane structure (12; 12 1) comprises a reinforcement region (18; 18 1 -18 9), wherein the reinforcement region (18; 18 1 -18 9) has a larger layer thickness (22 2) than an adjoining region (24; 24 1 -24 2) of the first membrane structure (12; 12 1), and an electrode structure, wherein the electrode structure is vertically spaced apart from the first membrane structure (12; 12 1); characterized in that: the first membrane structure (12; 12 1) comprises a deflectable region (46; 46 1) and a clamped border region, wherein the clamped border region adjoins the deflectable region (46; 46 1) along a borderline of the deflectable region (46; 46 1), wherein the reinforcement region (18; 18 1 -18 9) of the first membrane structure (12; 12 1) is arranged at the borderline; or the MEMS device comprises a second membrane structure (12 2), wherein the electrode structure is arranged between the first and second membrane structures(12 1 -12 2), wherein the first and second membrane structures (12 1 -12 2) each comprise a deflectable portion (46 1 -46 2), and wherein the deflectable portions (46 1 -46 2) of the first and second membrane structures (12 1 -12 2) are mechanically coupled by means of at least one mechanical connection element (54 1 -54 3) to each other and are mechanically decoupled from the electrode structure; wherein at least one of the first and second membrane structure (12 1 -12 2) comprises a reinforcement region (18; 18 1 -18 9) at a coupling position with the at least one mechanical connection element. the first membrane structure (12; 12 1) comprises a deflectable region (46; 46 1) and a clamped border region, wherein the clamped border region adjoins the deflectable region (46; 46 1) along a borderline of the deflectable region (46; 46 1), wherein the reinforcement region (18; 18 1 -18 9) of the first membrane structure (12; 12 1) is arranged at the borderline; or the MEMS device comprises a second membrane structure (12 2), wherein the electrode structure is arranged between the first and second membrane structures(12 1 -12 2), wherein the first and second membrane structures (12 1 -12 2) each comprise a deflectable portion (46 1 -46 2), and wherein the deflectable portions (46 1 -46 2) of the first and second membrane structures (12 1 -12 2) are mechanically coupled by means of at least one mechanical connection element (54 1 -54 3) to each other and are mechanically decoupled from the electrode structure; wherein at least one of the first and second membrane structure (12 1 -12 2) comprises a reinforcement region (18; 18 1 -18 9) at a coupling position with the at least one mechanical connection element.