Keyboard instrument

An electronic portable keyboard instrument, comprising:

• a plurality of keys arranged in a first direction;
• a plurality of hammers arranged in the first direction, respectively corresponding to the plurality of keys, each of the plurality of hammers including a force application point that is formed on one end side and that is pressed down when the corresponding key is pressed, a weight that is formed on another end side and imparts action weight to a pressed key, a fulcrum formed between the force application point and the weight, and a main hammer unit between the weight and the fulcrum so that the hammer rocks in vertical directions about the fulcrum when the corresponding key is pressed;
• a lower casing including a plurality of reinforcing members arranged in the first direction, each of the reinforcing members being formed in a gap between the plurality of hammers and having a shape of rib that is erected upward from the lower casing and that is running in a length direction of the keys, which is perpendicular to the first direction, from a lower side of the main hammer unit to a lower side of the weight in a side view as seen from the first direction;
• and
• a supporting member that supports each hammer by supporting the fulcrum thereof,
• wherein in each of the hammers, the weight has a lower limit for downward movement,
• wherein in each of the hammers, the weight has a greater thicknesses in the first direction than the main hammer unit, and has a greater vertical dimension than the main hammer unit,
• wherein in each of the reinforcing members, in the side view as seen from the first direction, a portion of the reinforcing member that is located below the main hammer unit extends vertically above a level of the lower limit, and a second portion of the reinforcing member that is located below the weight of the hammer does not extend above the lower limit, and
• wherein the supporting member sandwiches, from sides in the first direction, each hammer at the fulcrum so as to restrict movement of the hammer in the first direction such that if the keyboard instrument is placed vertically with one lateral end thereof being at a bottom and another lateral end thereof being at a top, the weight of the hammer leaning downward, shifting in position laterally in the first direction, due to gravity does not contact any of the reinforcing members.