A piezoelectric micro-blower including a blower body, a diaphragm (2; 50; 50a; 50b) secured to the blower body at a perimeter thereof and having a piezoelectric element (3; 52; 52a), and a blower chamber formed between the blower body and the diaphragm (2; 50; 50a; 50b), the piezoelectric micro-blower conveying compressive fluid by applying a voltage to the piezoelectric element (3; 52; 52a) to cause the diaphragm (2; 50; 50a; 50b) to bend, the piezoelectric micro-blower comprising: a first wall (1a; 30) of the blower body, the first wall (1a; 30) forming the blower chamber between the diaphragm (2; 50; 50a; 50b) and the first wall (1a; 30); a first opening (5a; 31) formed in a part of the first wall (1a; 30), facing a center of the diaphragm (2; 50; 50a; 50b), the first opening (5a; 31) allowing the inside and outside of the blower chamber to communicate with each other; a second wall (1b; 10) spaced from the first wall (1a; 30) and disposed opposite the blower chamber with the first wall (1a; 30) interposed between the second wall (1b; 10) and the blower chamber; a second opening (5b; 11) formed in a part of the second wall (1b; 10) facing the first opening (5a; 31); and an inflow path formed between the first wall (1a; 30) and the second wall (1b; 10), having outer ends communicating with the outside, and having inner ends connected to the first opening (5a; 31) and the second opening,. wherein a center space having an opening area greater than those of the first opening (5a; 31) and the second opening (5b; 11) is formed at the inner ends of the inflow path, the inner ends being connected to the first opening (5a; 31) and the second opening (5b; 11),. wherein the opening area of the center space is set such that a part of the first wall (1a; 30), the part facing the center space, resonates in response to displacement of the diaphragm (50; 50a; 50b). a first wall (1a; 30) of the blower body, the first wall (1a; 30) forming the blower chamber between the diaphragm (2; 50; 50a; 50b) and the first wall (1a; 30); a first opening (5a; 31) formed in a part of the first wall (1a; 30), facing a center of the diaphragm (2; 50; 50a; 50b), the first opening (5a; 31) allowing the inside and outside of the blower chamber to communicate with each other; a second wall (1b; 10) spaced from the first wall (1a; 30) and disposed opposite the blower chamber with the first wall (1a; 30) interposed between the second wall (1b; 10) and the blower chamber; a second opening (5b; 11) formed in a part of the second wall (1b; 10) facing the first opening (5a; 31); and an inflow path formed between the first wall (1a; 30) and the second wall (1b; 10), having outer ends communicating with the outside, and having inner ends connected to the first opening (5a; 31) and the second opening,. wherein a center space having an opening area greater than those of the first opening (5a; 31) and the second opening (5b; 11) is formed at the inner ends of the inflow path, the inner ends being connected to the first opening (5a; 31) and the second opening (5b; 11),. wherein the opening area of the center space is set such that a part of the first wall (1a; 30), the part facing the center space, resonates in response to displacement of the diaphragm (50; 50a; 50b).